Dodgy Wire

Dodgy Wire

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v8s4me

Original Poster:

7,242 posts

220 months

Saturday 22nd October 2016
quotequote all
"Only one?" I hear you say. laugh

I have several but this post concerns a dodgy looking wire coming off the top right of the fuse-board. It is un-fused, permanently live and goes through the bulkhead and disappears up behind the volt meter near the "no charge" light.

Before I disconnect it and see what stops working, does anyone have anything similar?

Incidentally, the "no charge" light has stopped working. I can't see the back of it so someone tell me what the colour coding is for the wires to this light and where they originate please?


v8s4me

Original Poster:

7,242 posts

220 months

Saturday 22nd October 2016
quotequote all
No, they all seem to be working fine. But thanks for the suggestion.

v8s4me

Original Poster:

7,242 posts

220 months

Sunday 23rd October 2016
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On checking again this morning it seems the volt meter isn't working either now and I've found another stray live.
Should this terminal on the back of the volt meter be connected (bottom left in photo)? To a live feed?


v8s4me

Original Poster:

7,242 posts

220 months

Sunday 23rd October 2016
quotequote all
jeff m2 said:
....Get diagram, check battery run.
Anyone got one?

v8s4me

Original Poster:

7,242 posts

220 months

Sunday 23rd October 2016
quotequote all
1981 280i Tasmin FHC S1



Fuse board looks like this...



This is the fuse layout...



Does this help?

I have a mate with an early Tasmin and the wiring diagram he has indicates the live feed to the volt meter comes off the left side of fuse 12.

v8s4me

Original Poster:

7,242 posts

220 months

Monday 24th October 2016
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jeff m2 said:
....The other wire of this light goes to the field coil of the alternator.....
There are three wires coming off the back of the alternator. Two heavy brown ones and a light gauge black one. According to diagrams I have looked at, this black one should go to the volt meter. Mine goes into the part of the loom leading into the headlights. This doesn't look right, but it does look original.

I'm still trying to trace the wire from the back of the charge light bulb.

v8s4me

Original Poster:

7,242 posts

220 months

Monday 24th October 2016
quotequote all
mrzigazaga said:
... I would of thought that that would come from the alternator?
Hi Mrk. Mine goes into the part of the loom leading into the headlights. Anyway, I have now got both the charge light and the alternator working! I'm not quite sure how, but I'm happy they are now working.

The next knock-on problem. Once everything started working properly again the RH headlight pod has thrown a wobbly. When I switch the headlights on, both pods pop up as required. When I switch off, both lights go off and both pods go down but the RH pod pops up again (no light) and then goes down. Weird!

Any suggestions anyone?

v8s4me

Original Poster:

7,242 posts

220 months

Monday 24th October 2016
quotequote all
Thanks for all the help and suggestions. I think I've finally go to the bottom of this. After getting everything working at around 5pm I started tidying everything up, zip-tying, covering cables with split conduit etc only to find the charge light and volt meter weren't working. By accident I'd left the AVO connected to the HRS circuit and noticed that it was only showing around 10V. There was no charge! So, everything back off again and started pulling and twisting wires. Eventually the answer. What seemed like a good connection this morning wasn't. Once I'd separated the lighter gauge black wire from the two heavy brown ones the faulty connection became obvious...



There were probably just a few strands of wire making contact and these finally came away once I started the tidy up. Too late to fix it today but at least I know where to start next time. Hopefully that will be it. Not a totally wasted day because a lot of very dodgy wiring got fixed hopefully preventing further problems down the line.

And the "dodgy wire"? That turned out to be the permanent live feed to the clock.

I've also sorted out what the relays control and I'll post that up later.

Thanks again for all the help.


v8s4me

Original Poster:

7,242 posts

220 months

Monday 24th October 2016
quotequote all
Relay Layout.......