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1Back to top Go down   Temp gage on RS Empty Temp gage on RS on Sun Jul 19, 2020 2:18 pm

Danish biker

Danish biker
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Just finished changing engine on my K1100 RS. I ended up with a LT engine. This engine has a wire and connection from the engine for temp gage.

Being ignorant I thought this connection just should be connected to a temp gage, but I’ve been advised that the connection from the engine and the connection from the gage, has to be connected elsewhere (guessing connections under the tank).

Does my RS wiring have these connections?


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2Back to top Go down   Temp gage on RS Empty Re: Temp gage on RS on Sun Jul 19, 2020 3:34 pm

Dai

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That black wire goes direct to the temperature gauge, via a small sub-loom. The other three wires you need (brown, green/black and slate/blue along with a yellow wire for a fuel gauge) should be under the tank in a single flat four-way block. If you look at a wiring diagram it's marked as 'connector for additional instruments'.

New:-

https://www.motorworks.co.uk/vlive/Shop/Parts.php?f=b&T=6&Q=61121459488&q=61121459488&NUFilter=15&Filter=submit

At that price I'd do what I've always done - cut the OEM plug off and make my own sub-loom for less than £10 using Molex connectors or similar. Of course, that does mean changing the connector on the temp/fuel gauges too, but it's still cheaper than the OEM part!

Secondhand:-

https://www.motorworks.co.uk/vlive/Shop/Parts.php?f=b&T=6&Q=61121459488&q=61121459488&NUFilter=10&Filter=submit

Half the price of the new item but still ridiculously expensive for what it is.


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

3Back to top Go down   Temp gage on RS Empty Re: Temp gage on RS on Sun Jul 19, 2020 5:36 pm

Danish biker

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Yo brother thanks but WAY to complicated for me with my lack of knowledge.

There are two connections. One coming from the engine and one coming from the temp gage.

All I need to know is:

Does my RS wiring have the two connections the engine wire connection and the temp gage connection had to go in to????


__________________________________________________
You have enemies? Good. That means you've stood up for something, sometime in your life.
-Sir Winston Churchill
    

4Back to top Go down   Temp gage on RS Empty Re: Temp gage on RS on Sun Jul 19, 2020 7:14 pm

Dai

Dai
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Yes. It's standard on every K but you will need that small sub loom. The gauge needs four wires:-

Brown - earth
Green/black - power
Slate/blue - light
Black - sensor

If the gauge doesn't have those four wires and/or they are not terminated in a flat, four-way green plug then there's no way to get the temp gauge working short of rewiring it yourself.

Anybody got a picture of the connector in the main loom? Both of mine are modded with click'n'lock connectors, so no use to show Danish Biker.


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

5Back to top Go down   Temp gage on RS Empty Re: Temp gage on RS on Sun Jul 19, 2020 9:56 pm

92KK 84WW Olaf

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I bought one of those sub looms from Motorworks to sort out the gauge on my 83 K100RS, less than £10.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska 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 105,200 miles
1983 K100RS 0011171 Fricka 606 29,495 miles Damn K Pox Its a Bat outta Hell Now 36,188  miles
    

6Back to top Go down   Temp gage on RS Empty Re: Temp gage on RS on Mon Jul 20, 2020 5:58 am

Danish biker

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@Dai wrote:If the gauge doesn't have those four wires and/or they are not terminated in a flat, four-way green plug then there's no way to get the temp gauge working short of rewiring it yourself.

The gage I’m buying is with a green connection ready to plug in, the wire from the engine is also in a “ready to plug in” connection. I just don’t know where they go?


__________________________________________________
You have enemies? Good. That means you've stood up for something, sometime in your life.
-Sir Winston Churchill
    

7Back to top Go down   Temp gage on RS Empty Re: Temp gage on RS on Mon Jul 20, 2020 6:01 am

Danish biker

Danish biker
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@92KK 84WW Olaf wrote:I bought one of those sub looms from Motorworks to sort out the gauge on my 83 K100RS, less than £10.
 But since the gage I’ll be getting already is in a green connection would I still need a sub loom? And if yes to you have a link/picture so I can see what a sub loom actually is.

I have 3 gages on hand. All wit the green connection and the “mount-plate” that goes into the engine, but I would bother buy one, if I can’t install it myself.


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You have enemies? Good. That means you've stood up for something, sometime in your life.
-Sir Winston Churchill
    

8Back to top Go down   Temp gage on RS Empty Temp. on Mon Jul 20, 2020 7:14 am

daveyson

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Find the plug under the tank (on the left hand side, if like a k100) the wire colours will verify you have the right plug.


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11/1985 bmw k100rt (late model)  Vin. 0090567
    

9Back to top Go down   Temp gage on RS Empty Re: Temp gage on RS on Mon Jul 20, 2020 8:17 am

Dai

Dai
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You need the sub loom, end of story. The black wire from the temperature sensor is a flying lead into the sub loom; it doesn't go anywhere near the main loom. If you don't have the sub loom then you won't get the correct earth, power and light connections. If you plug the temperature gauge straight into the plug on the main loom you will connect yellow to black and it will attempt to read fuel level.

The first link I posted has a good picture. Click on it to enlarge; you'll see the black flying lead. The white plug matches up with a white socket in the main loom. As Daveyson says, it's usually on the left side about halfway between the relay box and the headstock. Don't expect to see it straight away; it's a good bet that it's buried underneath the loom.

The orange plug is for a fuel level gauge.


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

10Back to top Go down   Temp gage on RS Empty Re: Temp gage on RS on Mon Jul 20, 2020 12:11 pm

Danish biker

Danish biker
Silver member
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N
@Dai wrote:You need the sub loom, end of story. The black wire from the temperature sensor is a flying lead into the sub loom; it doesn't go anywhere near the main loom. If you don't have the sub loom then you won't get the correct earth, power and light connections. If you plug the temperature gauge straight into the plug on the main loom you will connect yellow to black and it will attempt to read fuel level.

The first link I posted has a good picture. Click on it to enlarge; you'll see the black flying lead. The white plug matches up with a white socket in the main loom. As Daveyson says, it's usually on the left side about halfway between the relay box and the headstock. Don't expect to see it straight away; it's a good bet that it's buried underneath the loom.

The orange plug is for a fuel level gauge.

Sorry I totally missed your links (actually the whole post). Ok I now know what it is, and the price is crazy Crying or Very sad

I’m assuming this sub loom is a part of the LT wiring but not the RS. Think I finally understand.


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You have enemies? Good. That means you've stood up for something, sometime in your life.
-Sir Winston Churchill
    

11Back to top Go down   Temp gage on RS Empty Re: Temp gage on RS on Mon Jul 20, 2020 4:12 pm

Dai

Dai
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You've got it Very Happy Two things though:

1. The second link is to a secondhand sub loom taken from a stripped bike
2. Olaf says Motorworks sent him one for £10 (€14?). In my experience the price you see on Motorworks website for secondhand parts is usually the highest you'll pay. It's worth phoning them.

The sub loom is standard on the LT but is an option for all other bikes in the range. BMW used one main wiring harness for every K100 (and K75 as well - I think) and they all have the white socket on them. The fuel injection looms are different though.


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

12Back to top Go down   Temp gage on RS Empty Re: Temp gage on RS on Mon Jul 20, 2020 4:17 pm

92KK 84WW Olaf

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@Dai wrote:You've got it Very Happy Two things though:

1. The second link is to a secondhand sub loom taken from a stripped bike
2. Olaf says Motorworks sent him one for £5. In my experience the price you see on Motorworks website for secondhand parts is usually the highest you'll pay. It's worth phoning them.
Mine was new and I recall under £10 so I took it. My gauge hadn't been reading correctly and I hadn't had time to check the cause but the wiring was top of my list. !! PO had bought the gauge and sensor new. 


__________________________________________________
1992 K100LT 0193214 Bertha Alaska 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 105,200 miles
1983 K100RS 0011171 Fricka 606 29,495 miles Damn K Pox Its a Bat outta Hell Now 36,188  miles
    

13Back to top Go down   Temp gage on RS Empty Re: Temp gage on RS on Tue Jul 21, 2020 2:05 pm

Dai

Dai
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I've just snagged this lot off ebay UK:

https://www.ebay.co.uk/itm/BMW-K75-k100-k1100-temp-and-fuel-gauge/124267036010?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649

I don't really need the sub loom because my bikes are non-standard anyway. I only bought it to have the gauges and sensor as spares. If you're interested, you can have the sub loom for £15 and if you need them, the mounting panels for £2.50p each, plus shipping. PM me if you're interested.


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

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