Author Topic: Washer Light Case  (Read 572 times)

Offline SeanFD

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Washer Light Case
« on: January 25, 2022, 08:51:13 PM »
I've been working on the wiring of my little Rusty and have just got into the headlight bucket.

The parts fiche shows an item called "washer headlight case" used as a nut to hold the headlight in place (No 466 on the diagram)

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This had an earth wire attached (for the indicators as on the CB750K, I'm assuming) but I cannot see the reason for this as the indicators must be earthed on the mounting bracket – at least mine are.

Can anyone confirm this, which means the wiring is un-necessary?

If so also confirm the thread on the mounting bolts; I think it is M10x1.25?

Sean
CB750 K2 - Ridden from Belfast(SA)-2-Belfast(NI)!
CB750 K1 - The less, said the better!
CB450 K1 - A work in progress.
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Offline Bryanj

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Re: Washer Light Case
« Reply #1 on: January 25, 2022, 09:55:59 PM »
Probably used because its a standard part used on most Hondas, not sure of thread

Offline McCabe-Thiele (Ted)

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Re: Washer Light Case
« Reply #2 on: January 25, 2022, 11:53:00 PM »
I've been working on the wiring of my little Rusty and have just got into the headlight bucket.

The parts fiche shows an item called "washer headlight case" used as a nut to hold the headlight in place (No 466 on the diagram)

(Attachment Link)

This had an earth wire attached (for the indicators as on the CB750K, I'm assuming) but I cannot see the reason for this as the indicators must be earthed on the mounting bracket – at least mine are.

Can anyone confirm this, which means the wiring is un-necessary?

If so also confirm the thread on the mounting bolts; I think it is M10x1.25?

Sean

I thought the earth was for the headlamp unit not just the indicators.
Honda CB400 four super sport

Offline TrickyMicky

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Re: Washer Light Case
« Reply #3 on: January 25, 2022, 11:56:49 PM »
If my memory serves me correctly, all the green earth wires from all the other fittings in the shell finish up in a multi connector, and this could be the main earth lead return as the shell is plastic. If I'm wrong, sorry. Blame Anno Domini, a good meal, and alcohol.  Regards, Mike.

Offline taysidedragon

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Re: Washer Light Case
« Reply #4 on: January 26, 2022, 12:41:09 AM »
If my memory serves me correctly, all the green earth wires from all the other fittings in the shell finish up in a multi connector, and this could be the main earth lead return as the shell is plastic. If I'm wrong, sorry. Blame Anno Domini, a good meal, and alcohol.  Regards, Mike.

I'm pretty sure you're right. The headlight and indicator bracket is rubber mounted so not a good earth, hence the earth wires.
Gareth

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Offline K2-K6

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Re: Washer Light Case
« Reply #5 on: January 26, 2022, 08:59:10 AM »
Aren't there various rubber mounts that would make the earth route at least patchy on the fork ear ? Hence the need to have a competent earth strap to indicators.

Offline Alexrayz

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Re: Washer Light Case
« Reply #6 on: January 26, 2022, 09:55:18 AM »
I had that issue a few months back when I was redoing my wiring. The green wires on these nuts are there to improve the grounding of the mounting bracket.
With the plastic shell, the paint and the rubber mounts, it is not the most conductive area. Had me scratching my head for a while as whenever the headlight lens and metal ring touched the front mudguard the lights would improve by 50% if not more compared to when it was on the bucket.
Turns out it was just the ground that was shite in that area.
If it aint broken don't fix it

Offline SeanFD

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Re: Washer Light Case
« Reply #7 on: January 26, 2022, 10:45:32 AM »
Thanks for the thoughts guys. I had considered some of those. But ...

Looking at the wiring diagram I have:

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There are 8 earth connections all coming from the main loom as shown in the pic, so the headlight bucket, being plastic as noted, doesn't come into it.

Unlike on the 750, the things that screw into these "washers light case" are just reflectors; the indicators are mounted on arms from the headlight mounting bracket, or stay as Honda calls it. Now although this is rubber mounted, I am still getting an earth connection on the indicator mounting bolts, which is why I thought the earthing nuts were, perhaps, superfluous.

The indicators were not working properly last night, so I'm going to go with Alexrayz's suggestion that the bracket is not well earthed. Off out now to test the hypothesis; I'll let you know.
CB750 K2 - Ridden from Belfast(SA)-2-Belfast(NI)!
CB750 K1 - The less, said the better!
CB450 K1 - A work in progress.
CB400F Supersport - It's rusty - not any more!

Offline Alexrayz

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Re: Washer Light Case
« Reply #8 on: January 26, 2022, 02:26:06 PM »
It does connect to the side reflectors but it also connects with the headlight mounting bracket. I guess this is where you're supposed to get your connection to the metal body of the bike. Crud can get in there and make it less conductive.
Best thing to do is to use a multimeter in continuity mode, attach the black probe to the negative terminal of the battery and then use the over probe ti check for continuity. Where it doesn't beep is where you have bad grounding.
If it aint broken don't fix it

Offline SeanFD

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Re: Washer Light Case
« Reply #9 on: January 26, 2022, 06:35:13 PM »
I connected the two wires, and ..... everything worked!  ;DExcept one front indicator. :(

I decided to check the bulb and (this took a little while as I got distracted). The bulb was OK. I switched the two front bulbs anyway, and ... nothing worked!!  :-[

Well not quite nothing; when I indicated left, the right instrument panel light worked, and when I indicated right, the rear left indicator worked.

I spent ages checking everything, and then noticed that the voltage at one point was only 8,5V. The battery I was using is on old one with a bit of history, though it does seem to hold a charge when not stressed.

I'm not sure why a low voltage would cause the strange happenings, but I put it on charge and moved on to other things. I will ry again tomorrow.

Oh, I did find out that the wiring and feed to the coils is OK; with the kill switch on "Run" the coils got quite warm. Which may explain my flat battery!!

Ah well.
CB750 K2 - Ridden from Belfast(SA)-2-Belfast(NI)!
CB750 K1 - The less, said the better!
CB450 K1 - A work in progress.
CB400F Supersport - It's rusty - not any more!

Offline Alexrayz

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Re: Washer Light Case
« Reply #10 on: January 26, 2022, 10:16:09 PM »
I connected the two wires, and ..... everything worked!  ;DExcept one front indicator. :(

I decided to check the bulb and (this took a little while as I got distracted). The bulb was OK. I switched the two front bulbs anyway, and ... nothing worked!!  :-[

Well not quite nothing; when I indicated left, the right instrument panel light worked, and when I indicated right, the rear left indicator worked.

I spent ages checking everything, and then noticed that the voltage at one point was only 8,5V. The battery I was using is on old one with a bit of history, though it does seem to hold a charge when not stressed.

I'm not sure why a low voltage would cause the strange happenings, but I put it on charge and moved on to other things. I will ry again tomorrow.

Oh, I did find out that the wiring and feed to the coils is OK; with the kill switch on "Run" the coils got quite warm. Which may explain my flat battery!!

Ah well.

We’ll shit, your bike is cross eyed!
Just out of curiosity, what was the issue that led you to work on the wiring?
If it aint broken don't fix it

Offline K2-K6

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Re: Washer Light Case
« Reply #11 on: January 26, 2022, 10:33:04 PM »
Ever seen an older car when someone indicates AND the brake light comes on (rear view) then the whole light panel flashes dimly ?

Ordinarily that's a compromised earth on one of the lights, the activity then tries to scavenge an earth through commonality with the other lights under the load the circuit is running at, making it look like a complex unexplained problem but in reality just an earth drop out.

As Alex mentioned earlier, worth tracking each component's earth back to battery to identify the fault.

Offline SeanFD

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Re: Washer Light Case
« Reply #12 on: January 26, 2022, 10:41:15 PM »
We’ll shit, your bike is cross eyed!
Just out of curiosity, what was the issue that led you to work on the wiring?

The bike was a restoration project, or rather turned into one - at first I thought I could just get it going  and ride it for a while for fun. Then when I looked more closely ....

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I've repaired what could be repaired, replaced what couldn't and cleaned everything up.
CB750 K2 - Ridden from Belfast(SA)-2-Belfast(NI)!
CB750 K1 - The less, said the better!
CB450 K1 - A work in progress.
CB400F Supersport - It's rusty - not any more!

Offline SeanFD

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Re: Washer Light Case
« Reply #13 on: January 26, 2022, 10:43:20 PM »
Ever seen an older car when someone indicates AND the brake light comes on (rear view) then the whole light panel flashes dimly ?

Ordinarily that's a compromised earth on one of the lights, the activity then tries to scavenge an earth through commonality with the other lights under the load the circuit is running at, making it look like a complex unexplained problem but in reality just an earth drop out.

As Alex mentioned earlier, worth tracking each component's earth back to battery to identify the fault.

I've now done that and will go and try it all out gain tomorrow when teh batter has charged overnight - with the coils disconnected this time.
CB750 K2 - Ridden from Belfast(SA)-2-Belfast(NI)!
CB750 K1 - The less, said the better!
CB450 K1 - A work in progress.
CB400F Supersport - It's rusty - not any more!

Offline Kelly E

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Re: Washer Light Case
« Reply #14 on: January 27, 2022, 01:20:22 AM »
Yes the threads are 10mm X 1.25mm
The Rust Brothers Garage Collection
1974 Honda CB550 K0
1975 Honda CB400F Super Sport
1979 Honda CB750F Super Sport
1980 Suzuki GS1100E
1982 Honda CB900F Super Sport
1983 Honda CB1100F
1984 Honda VF700S Sabre
1984 Honda VF1000F Interceptor
1990 Moto Guzzi 1000 Le Mans
1994 Kawasaki Concours ZG1000
2006 Harley Davidson Fat Boy

 

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