Topic: Park light always on. Even when key is removed.

[bullfinch]

Vin CB7502105***

For whatever reason after fixing every other issue on my cb750 my lights have started to act up.
Its been a project since forever with an engine rebuild etc.

The other day suddenly my park light was always on.
I had a fuel cock that leaked 10 liters of fuel everywhere even though it was off for 3 weeks. I replaced the fuel cock, removed fuel from the air filter box and refitted it. I might have touched some cables when working with the air box. This is why I mention it.

I checked the wiring diagram and haynes claim both french and german sohc have a brown wire that goes to the ignition switch and to the park lights. Therefore I was thinking the ignition switch was the problem. I took apart the ignition switch two hours ago and someone has done their part modifying it. Even when its completely apart the park light is stil on. I have some electrical skills, but as the ignition switch has been spliced into the wiring harnes im not able to disconnect the wires from eachother without cutting wires and futher molesting the harness. Right now im looking for reasons to why this has suddenly happened, further steps to diagnose the problem or which wire to cut in the modded ignition switch if any.

The brown and red wire in the back are soldered together and they are 12v/hot. Im considering desodering a wire in order to try to locate what is going to the front and rear park light.

Should I start to cut a wire or any other steps i should take?

[bryanj]

Get a new, correct switch

[scottly]

When the key switch is in the P (park) position, the red wire is connected (sodered??) to the taillight brown wire, and the key can be removed. With the key in the off position, there should be no connection between the red and brown wires, and the key can also be removed.

[bullfinch]

Soldered, sorry.
I changed it in my text.

Thanks for your tips. Ill try to disconnect the front park light bulb and try to locate which wire it is getting power from.

[willbird]

Vin CB7502105***



I checked the wiring diagram and haynes claim both french and german sohc have a brown wire that goes to the ignition switch and to the park lights.

On my K2 there is a brown wire in the headlight shell that is not used, my understanding is that Euro bikes were required to have an illuminated side marker light that the brown wire was used for in those markets.

Bill

[Deltarider]

Vin CB7502105***



I checked the wiring diagram and haynes claim both french and german sohc have a brown wire that goes to the ignition switch and to the park lights.

On my K2 there is a brown wire in the headlight shell that is not used, my understanding is that Euro bikes were required to have an illuminated side marker light that the brown wire was used for in those markets.

Bill

Not a side marker light, but a small Ba9s bulb in the headlight reflector, a pilot light also known as city light which is also a parklight.

[willbird]

Vin CB7502105***



I checked the wiring diagram and haynes claim both french and german sohc have a brown wire that goes to the ignition switch and to the park lights.

On my K2 there is a brown wire in the headlight shell that is not used, my understanding is that Euro bikes were required to have an illuminated side marker light that the brown wire was used for in those markets.

Bill

Not a side marker light, but a small Ba9s bulb in the headlight reflector, a pilot light also known as city light which is also a parklight.

Interesting :-). I have seen a few reflectors that had the socket for a small bulb like you decribe.

[bryanj]

In the UK we have an increfibly large book called"  Construction and Use Regulation for Motor Vehicles" which has evolved over many decades, talks utter government crap and regularly contradicts itself but in there a motor vehicle with lights must have "obgliatory lights" which is the small front light and 5 watt rear light.
Aparently headlamps are optional but if fitted must work and have a dip that does not dazzle .
Just more useless info for you all

[scottly]

The other day suddenly my park light was always on.

If the problem suddenly started, what changed?

[bullfinch]

Lately i fixed the leaking fuel cock and removed and replaced the air filter since the fuel leak left some fuel in the air filter box. I have now desoldered the wires from the ignition switch and unplugged the wires to the park lamps. If i plug the wires in they still light up. So the ignition switch seems to have nothing to do with it.

Trying to trace the wires for the park lights right now.

[willbird]

In the UK we have an increfibly large book called"  Construction and Use Regulation for Motor Vehicles" which has evolved over many decades, talks utter government crap and regularly contradicts itself but in there a motor vehicle with lights must have "obgliatory lights" which is the small front light and 5 watt rear light.
Aparently headlamps are optional but if fitted must work and have a dip that does not dazzle .
Just more useless info for you all

It could be worse, they could require the port and starboard lights used on boats so one can easily tell if you are coming or going :-).
https://aceboater.com/navigation-lights

[bullfinch]

I found the short circuit. Making a new wire now, cleaning the switch while I'm at it.

Thanks for the support!

The red and brown wire from the original wire loom has a short on its way to the ignition switch.

I'm very happy that I was able to figure this out.

[bullfinch]

Photo of the problem cable.

[bryanj]

The butt splices higher up suggest its been played with

[Don R]

 It probably once had the key switch relocated up to the light panel/top tree area. I'm a big fan of the vintage connections Honda 3.5mm bullet connector kit and crimper. I've been able to make a lot of modified wiring appear original again.
 I accidentally ordered 4mm bullet connectors once and they come in handy on my Suzuki, the Kawasaki I sold and race car.