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1Back to top Go down    1985 K100 low fuel light ? Empty 1985 K100 low fuel light ? Mon Oct 21, 2013 1:39 pm

alanretired '85 K100

alanretired '85 K100
active member
active member
Under the tank, there is a fuel pump/ low fuel light connection. When I was taking the tank off I noticed one of 4 wires broken.. 1/4 inch from the connector. I wanted to fix it but all the wires, from age or oil/fuel contamination were very stiff non flexible and I did not want to break any others since the bike runs and the fuel pump works. I'm assuming that the broken wire goes to the low fuel light. The red triangle dash light stays on. I would cut the wires farther back and reconnect them to the little round plug that connects to the "fuel pump/ low fuel light" sender unit but not sure if that is possible. Or if it is possible to get a new connector. Any Ideas?
Thank you,
Alan

    

2Back to top Go down    1985 K100 low fuel light ? Empty Re: 1985 K100 low fuel light ? Mon Oct 21, 2013 2:39 pm

Inge K.

Inge K.
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alanretired wrote: Or if it is possible to get a new connector. Any Ideas?
Thank you,
Alan
The connector for the factory alarm (in the relay box) is identical.



Last edited by Inge K. on Mon Oct 21, 2013 2:40 pm; edited 1 time in total


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

3Back to top Go down    1985 K100 low fuel light ? Empty Re: 1985 K100 low fuel light ? Mon Oct 21, 2013 2:39 pm

92KK 84WW Olaf

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Is the connector at the front left of the fuel tank?  I have an 84RT and its at the front left, on the 92LT its at the rear right.

At a guess you could remake it but my own thought is to get a good connector off another bike and make a junction on them far enough back to give you plenty of spare length but also so the connector is located in the dry under the fuel tank. That way you preserve the colour coding. I don't know the wiring well enough to know if its possible to trace them all the way to the other ends but I imagine they are all wrapped into the loom.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

4Back to top Go down    1985 K100 low fuel light ? Empty Relay box? Mon Oct 21, 2013 3:14 pm

alanretired '85 K100

alanretired '85 K100
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Where is the Relay Box located? The connector is at the left front side of the tank.
Thanks.
Alan

    

5Back to top Go down    1985 K100 low fuel light ? Empty Re: 1985 K100 low fuel light ? Mon Oct 21, 2013 3:35 pm

robmack

robmack
Life time member
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If it is the fuel tank connector located on the right side of the bike midway down the frame, then common practice is to replace that connector rather than repair it.  Many people use a commonly available 4-pin trailer connector pair.  I'd look into using AMP SureSeal connectors readily available on Ebay.  They are waterproof and easy to connect/disconnect.

Your description was unclear to me because I also read that possibly the breakage is 1/4" away from the tank, near the plate that  supports the fuel level sender.  Is that correct?

The red triangle is for the bulb monitoring unit, and not the low fuel indication.  Low fuel is indicated in a red rectangle with a gas pump symbol just below the speedometer.  If the red triangle stays on, then you have a burnt out bulb or a wiring error somewhere in the brake light system.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

6Back to top Go down    1985 K100 low fuel light ? Empty Re: 1985 K100 low fuel light ? Mon Oct 21, 2013 3:54 pm

duck

duck
Life time member
Life time member
alanretired wrote:Where is the Relay Box located? The connector is at the left front side of the tank.
Thanks.
Alan
Under the rear of the tank.  Black plastic box with fuses on the left side of it.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

7Back to top Go down    1985 K100 low fuel light ? Empty Re: 1985 K100 low fuel light ? Mon Oct 21, 2013 3:56 pm

sidecar paul

sidecar paul
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Life time member
Alan,
The relay box is located under the back of the fuel tank. You need to lift the back of the tank to remove the cover.
Assuming you do not have the factory alarm fitted, you'll find the 4 pin connector on a tail from the loom.

Paul.


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

8Back to top Go down    1985 K100 low fuel light ? Empty red triangle ? Mon Oct 21, 2013 8:04 pm

alanretired '85 K100

alanretired '85 K100
active member
active member
What is the difference if the red triangle light stays on vs repeatedly goes on and off. When I rode it today it  did both at different starts. All the lighting works, I did add 3x10 inch array of leds connected at the stop bulb. bulb works also. If that is making the triangle light how do I turn it off?

    

9Back to top Go down    1985 K100 low fuel light ? Empty Re: 1985 K100 low fuel light ? Mon Oct 21, 2013 8:54 pm

RicK G

RicK G
admin
admin
The red triangle will flash when you first turn the ignition on and will flash till both the front and rear brake levers are operated and the switches turn the brake light on then it should stop flashing as it has tested and found the circuits to be OK. If it keeps flashing then there is a fault with either the front or rear brake light circuits.
The triangle light will come on and stay on if either the stop or tail light bulb aren't working but that is just the bulbs not the rest of the circuit.
This is what should happen if all is working as it should.
The 2 low fuel lights are in the speedo and one is marked with a 7 and the other with a 4 representing 7 and 4 litres left to empty and pushing it to the next gas pump.
The four wires that come from under the tank are ground - brown, fuel pump - green and then green/white after the plug, 7 litre warning light - yellow and 4 litre warning light - white.
The relay box is located under the fuel tank and you need to lift the rear of the tank and unclip the flat black plastic lid.
The LEDs should not cause any problems. They are very low current and the bulb monitoring Unit would not even know they are there.

Please put the year and model and VIN or engine number in the signature line so as to help us know which model you have. Go to PROFILE on the menu and you can do it there.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

10Back to top Go down    1985 K100 low fuel light ? Empty Re: 1985 K100 low fuel light ? Mon Oct 21, 2013 10:17 pm

robmack

robmack
Life time member
Life time member
Is your bike equipped with ABS brakes?


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

11Back to top Go down    1985 K100 low fuel light ? Empty Re: 1985 K100 low fuel light ? Mon Oct 21, 2013 10:30 pm

robmack

robmack
Life time member
Life time member
@RicK G wrote:The four wires that come from under the tank are ground - brown, fuel pump - green and then green/white after the plug, 7 litre warning light - yellow and 4 litre warning light - white.
Rick,
Wasn't the early K's using a sensor that detected 7L and 4L volumes whereas later K's had a variable resistor to detect levels and a switched circuit to indicate low fuel.

I think the 4L bulb was removed in the later instrument panels, leaving the 7L light to indicate low fuel.

The early K wiring is brown/white = 4L, brown/black = 7L, green/black = fuel pump +12V and brown = ground
The later K wiring is white = low fuel, green = fuel pump +12V, brown = ground and green/white = variable fuel level

I hope this is correct information.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

12Back to top Go down    1985 K100 low fuel light ? Empty Re: 1985 K100 low fuel light ? Mon Oct 21, 2013 10:40 pm

RicK G

RicK G
admin
admin
alanretired wrote:Where is the Relay Box located? The connector is at the left front side of the tank.
Thanks.
Alan
Rob it is an early model


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

13Back to top Go down    1985 K100 low fuel light ? Empty Re: 1985 K100 low fuel light ? Mon Oct 21, 2013 10:51 pm

RicK G

RicK G
admin
admin
@robmack wrote:
@RicK G wrote:The four wires that come from under the tank are ground - brown, fuel pump - green and then green/white after the plug, 7 litre warning light - yellow and 4 litre warning light - white.
Rick,
Wasn't the early K's using a sensor that detected 7L and 4L volumes whereas later K's had a variable resistor to detect levels and a switched circuit to indicate low fuel.

I think the 4L bulb was removed in the later instrument panels, leaving the 7L light to indicate low fuel.

The early K wiring is brown/white = 4L, brown/black = 7L, green/black = fuel pump +12V and brown = ground
The later K wiring is white = low fuel, green = fuel pump +12V, brown = ground and green/white = variable fuel level

I hope this is correct information.
I was going by the circuit diagrams in the Haynes manual. S now I don't know who is right and wrong but there is a lot of confusion regards this issue and we need to sort it out.
Poor Alan is probably scratching his head thinking what is going on here and who do I believe.

If I am wrong then all very well I will correct the my diagrams,  and even send Haynes a Email to say what the heck.
Is there someone with an early K that can look and tell us what colours are actually there.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

14Back to top Go down    1985 K100 low fuel light ? Empty Re: 1985 K100 low fuel light ? Mon Oct 21, 2013 11:20 pm

92KK 84WW Olaf

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Life time member
Life time member
My 84 RT has the connecter at the front left of the tank and has the 7l orange and 4 l red low fuel lights.

The 92 Lt has the connections the rear right of gas tank and only has a red 5l warning. I am not sure when the change came in, was it to make way for ABS warning?

Anyway that connector at front left also left me down one day and is temporarily cured by having opened the pins slightly to make a better interference fit and electrical connection.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

15Back to top Go down    1985 K100 low fuel light ? Empty Re: 1985 K100 low fuel light ? Tue Oct 22, 2013 12:30 am

RicK G

RicK G
admin
admin
The change came in 1985 and ABS not till 1988. From what I gather the early system was very unreliable.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

16Back to top Go down    1985 K100 low fuel light ? Empty Re: 1985 K100 low fuel light ? Tue Oct 22, 2013 4:02 am

duck

duck
Life time member
Life time member
86+ bikes:

Brown - ground
Green/White - fuel pump 12V
White - 4L low fuel indicator in cluster
Yellow - variable resistance for optional fuel gauge


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

17Back to top Go down    1985 K100 low fuel light ? Empty red triangle light stays on Tue Oct 22, 2013 12:16 pm

alanretired '85 K100

alanretired '85 K100
active member
active member
thanks for the information. The triangle light stays on and all the bulbs work fine. The low fuel light broken wire I think I'll ignore and keep the tank full! One of the POs must have done a lot of guessing electrical work on this bike.

    

18Back to top Go down    1985 K100 low fuel light ? Empty Re: 1985 K100 low fuel light ? Tue Oct 22, 2013 9:18 pm

RicK G

RicK G
admin
admin
@alanretired '85 K100 wrote:thanks for the information. The triangle light stays on and all the bulbs work fine. The low fuel light broken wire I think I'll ignore and keep the tank full! One of the POs must have done a lot of guessing electrical work on this bike.
I use a digital gauge where you stick your longest digit into the tank and if it comes out with fuel on it there is enough for 150 more kms:D


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

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