BMW K bikes (Bricks)

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lefthander

lefthander
Silver member
Silver member
I have a 1992 k75 low seat bike. I recently found a pair of halogen fog lights and brackets that were an option around 1986 for the k models back then. They are rectangle in shape and I have seen a few pictures in old brochures advertising them as an option. Does anyone know if there is some connecter on my bike that bmw may have left in the wiring harness that I could plug them into on my bike? I would like to change the original bulbs out to led light bulbs as well. Thanks


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1992 k75 standard low seat. (transforming into a K75T low seat). roundel
    

Dai

Dai
Life time member
Life time member
Taking this from the top and making no assumptions about your electrical knowledge:

- the lights and brackets might be in good shape but the reflectors will be completely shafted. Around that period the reflectors lost 60% of their reflectivity within four years of manufacture, so you might want to consider replacing the internals

- don't fit LEDs. They will not sit at the correct focal length for the reflector and will either blind oncoming traffic or will have a completely useless beam spread

- fuse 4 is a good option as it's not normally used but you may have problems sourcing the terminals. They are available but usually only in quantity, so your best bet is a fuse on a cable

https://www.ebay.com/itm/5-x-Inline-Fuse-Holder-12V-30A-DC-For-Standard-Blade-Fuses-Splash-Proof-Car-Bike/133113858785?hash=item1efe344ae1:g:~f4AAOSwSHBdLetm).

Alternatively, you can fit a 4-way fuse box next to the existing seven-way box. There is room to surface-mount one (Charlie!!! Didn't you have some pics of this idea?)

- use a four pin relay to wire them in. Work as follows:

-- one end of the fuse to the battery
-- other side to pin 30 on the relay
-- pin 87a on the relay to a toggle switch mounted somewhere up front e.g. on the 'crashpad'

https://www.ebay.com/itm/On-Off-SPST-Toggle-Switch-250V-AC-15A/282558340886?epid=9004679011&hash=item41c9ca1f16:g:6K0AAOSwOMdZXNox

-- other side of the toggle switch to the bulb-holder positive on the lights
-- check the earth for the lights. It might go through the brackets or you might have to add a wire. If so, use a brown coloured wire that will take a minimum of sixteen amps and run it to the earth point under the tank
-- pin 85 on the relay also goes to earth
-- connect pin 86 on the relay to the slate (grey)/black wire that runs to the tail light
-- use a 15 amp or even a 20 amp fuse. 50 watt halogens draw 4.16 amps (watts / volts = amps: (50 / 12 = 4.16) x 2 = 9.32 amps). Although that is less than 10 amps, the inrush current to a cold filament will easily exceed ten amps and will blow a 10 amp fuse.

The end result (hopefully!) is that you will have a toggle switch to turn the lights on/off and a relay that will cut the feed to the lights when the ignition is turned off. No little monsters walking by and flattening your battery.

Fusebox terminals if you want to use fuse 4 instead of a separate fuse/fusebox:

https://www.ebay.com/itm/High-Quality-Durable-50Pcs-4-8mm-Female-Copper-Fuse-Box-Terminals-N-907-327-03/253961449770?hash=item3b2148312a:g:FSkAAOSwb8Vb3AQO



Last edited by Dai on Fri Dec 18, 2020 6:44 pm; edited 3 times in total (Reason for editing : Stopped being a lazy git and dug the fuse box terminal out of the tray in front of me)


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

lefthander

lefthander
Silver member
Silver member
Thanks Dai! I just need to source the light inards now.


__________________________________________________
1992 k75 standard low seat. (transforming into a K75T low seat). roundel
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Unless you are totally committed to OEM parts on your bike, I would suggest the following if you want to add driving/conspicuity lights.  

Get an Eastern Beaver headlight relay wiring harness.  It bypasses the handlebar switches for the high current of the headlight.  This protects the rather delicate switch contacts from overheating damage as they age and gives a brighter headlight.

Since the Eastern Beaver harness only runs a few milliamps through the switches to power the relays in the harness, you can now easily add LED driving lights by tapping into the bike's handlebar headlight switch wiring.  

A single pole double throw switch with a center off position will allow you to have the driving lights on all the time(daytime), off, or only with the high beam(used at night to avoid blinding oncoming drivers).

I get my driving lights on eBay.  There are lots of them there, and they are quite reasonably priced.  The last pair I got were $18 with free shipping.  Most have 10W LED's that draw less than 1 amp.  Get the spotlight beam pattern to throw the maximum light down the road.


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Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

tinyspuds

tinyspuds
Life time member
Life time member
+1 on the Eastern Beaver kit. Very noticeable improvement plus uplift in switch longevity.

But do note the import duty from Japan.

At the same time I added the EB 8 way auxiliary fuse box to make all my toys switchable.



Last edited by tinyspuds on Sat Dec 19, 2020 7:38 am; edited 2 times in total (Reason for editing : import duty & aux fuse box)


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106. (Not blind to the irony of an April 1 production date).
1986 K100RS in boxes. VIN 0141918.
1954 Royal Enfield 350 Bullet. Original.
    

6Back to top Go down   1986 BMW oem optional fog lights install question Empty Eastern Beaver relay kit Sun Dec 20, 2020 3:49 am

lefthander

lefthander
Silver member
Silver member
I have done the Easteren Beaver headlight relay kit. I bought the one with a terminal to add driving lights. Hopefully I could tie into that and keep the fog lights halogen bulbs? I also am installing the Eastern Beaver fuse block (PC8)? as we speak. I am adding a pair of led lights that I did buy on ebay. I'm running the E.B. headlight relay kit through it along with a gps, radar detector and an extra power outlet. I have done the 50 amp alternator upgrade. All of this through help on this forum. Hopefully I don't cook my bikes electrical. I've been getting it ready to do a cross country trip. Am I overloading my electrical system? I added heated grips about 2 years ago per ducks guidance. Want to use these oem lights for daytime conspicuity.  santa rendeer


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1992 k75 standard low seat. (transforming into a K75T low seat). roundel
    

tinyspuds

tinyspuds
Life time member
Life time member
I’m running standard halogen in the head but an LED strip in the running light.

My GPS runs off fuse 6 in the OEM in place of the Clock.

From the EB fuse block I run:

1 LED spot on the chair
Heated grips
Heated socks
1 LED fog at the back
1 volt meter
2 USB ports - normally charging Phone and tablet.

This stuff is all switchable from the crash pad rockers. The EB block is wired into the rear light (UK bike, no full time running lights) so the switched fuses are triggered through the OEM sidelight switch on the bars (everything on the new circuits can be isolated with a single action).

I also use a 50 alternator, but tbh I never really got close to stretching even the OEM 

It’s prudent to list all the kit you have and work out your max simultaneous load, but I don’t think you’ll have an issue.

Like you, if it wasn’t for this forum I’d just be in the shed polishing the wheels...


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106. (Not blind to the irony of an April 1 production date).
1986 K100RS in boxes. VIN 0141918.
1954 Royal Enfield 350 Bullet. Original.
    

8Back to top Go down   1986 BMW oem optional fog lights install question Empty oem auxilary lights Wed Jan 06, 2021 5:27 pm

lefthander

lefthander
Silver member
Silver member
I found a brand new set of the auxiliary lights that includes the switch and wiring harness. Both lights do work. The harness has a plug that fits into what is called  the Plug connection special equipment. It is in the electrical box under the seat. When I plug it together though only one light works. 
 My question is, should the auxiliary light harness plug work correctly with the Plug connection special equipment port? 
 I apologize for the complicated wording. In the wiring diagram they call this port: Plug Connection Special Equipment. Thank you


__________________________________________________
1992 k75 standard low seat. (transforming into a K75T low seat). roundel
    

Laitch

Laitch
Life time member
Life time member
The lamps should differ in output. One should be a high beam; one should be a flood beam. Which is working and how did you test both of them? Have you checked for current at the relay box connector pin of the non-working light? How many sockets does the light assembly's plug have? Please post a photo of it.


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1995 K75 81,000 miles
1986 BMW oem optional fog lights install question Usa-lo10
    

10Back to top Go down   1986 BMW oem optional fog lights install question Empty auxiliary lights oem Fri Jan 08, 2021 11:59 pm

lefthander

lefthander
Silver member
Silver member
The plug that comes with my harness has 4 female pins in it. It has 2 relays. It also has an oem light switch that I can place in the dash along with the hazard switch and heated grip switch. The Plug connection special equipment has 5 male pins. Both lights have been tested and both work. I plugged each light in the wiring harness that has 2 terminals, 1 for each light. Both would work in one side of the harness, but one terminal in the harness that allows you to plug the lights in has no power. I apologize for not posting pictures. I don't have that ability right now. I want to use the oem switch. Do I need 2 relays? I do have the Eastern Beaver Fuze block and have updated my headlight with the Eastern Beaver Headlight harness. I purchased the E.B. headlight harness with the extra auxiliary light wire. Thank you for your consideration with this issue.


__________________________________________________
1992 k75 standard low seat. (transforming into a K75T low seat). roundel
    

jbt

jbt
Gold member
Gold member
Your K has a free  plug in the relay box dedicated to options such as additionnal lights.
Why not simply use it?

    

12Back to top Go down   1986 BMW oem optional fog lights install question Empty auxiliary lights oem Sat Jan 09, 2021 9:22 pm

lefthander

lefthander
Silver member
Silver member
Yes it does and I connected to the Plug connection extra equipment port, however only one light will come on. The switch works but I can only get one light to come on. I've tested both lights and they both will come on when I switch the light terminals. I'm just missing something and can't quite get it. In my previous post I tried to share with my limited electrical knowledge.


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1992 k75 standard low seat. (transforming into a K75T low seat). roundel
    

13Back to top Go down   1986 BMW oem optional fog lights install question Empty Auxiliary light install victory Sun Jan 10, 2021 4:28 am

lefthander

lefthander
Silver member
Silver member
After searching some other posts here I have the auxiliary lights running properly I believe. It's 3:15 am here and while searching the headlight upgrade post there was an explanation of the Plug connection special equipment connector. When I plugged the lights in only 1 light came on (fog lamp) however the other lamp (driving lamp) didn't come on, that was until I flipped the high beam on, then the fog lamp went out and the driving lamp came on.  cheers I am elated that they operate now. If you've read any of my earlier posts I've been trying to figure this out for awhile. Had I flipped my hi beam switch on 3-4 days ago when I was wrestling with this I would have been done. Oh well, nothing like the learning curve with success. 
 I have a ton of gratitude for those who have helped and guided me on this forum. Thank you all so much for all the insight and now Goodnight.


__________________________________________________
1992 k75 standard low seat. (transforming into a K75T low seat). roundel
    

Dai

Dai
Life time member
Life time member
Big thumb


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

charlie99

charlie99
VIP
VIP
1986 BMW oem optional fog lights install question 112350


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O1986 BMW oem optional fog lights install question Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

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