Temperature gauge/ Electrical issues

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Temperature gauge/ Electrical issues

February 15, 2025, 10:43:12 AM

Hi all!

New to this site. I own a Lhassa green Mk1 Gti but am currently restoring a Mk2 2.0L Driver for the mrs. Its got a few electrical gremlins I'm hoping someone may be able to help with?
Firstly the CE2 version (1992). The temperature gauge only works when I turn the headlights on??!!. Also I can not get the horn to work. Ive changed the X relay, the temp senders etc. Also the rad fan is very intermittent, it will come on then go straight off after 3 secs or so.
Anyone experienced similar issues? Any help is greatly appreciated, thanks, Dom

Re: Temperature gauge/ Electrical issues

Reply #1 – February 15, 2025, 03:39:11 PM

Don't know about most of your problems but does the horn contact on the back of the steering wheel making contact via the wheel slip ring? I presume you have checked the horn does operate if you attach a live feed.

Re: Temperature gauge/ Electrical issues

Reply #2 – February 15, 2025, 04:27:48 PM

Yes I have tried this. The horn does work with a live feed to it

Re: Temperature gauge/ Electrical issues

Reply #3 – February 20, 2025, 11:56:42 AM

Your only option is to use the wiring diagram from the Haynes manual and check all the connections for faults using a multi meter. I would be checking for obvious signs of corrosion, for example at the main connection for the fan, as they tend to get corroded with age, and broken wires.

Re: Temperature gauge/ Electrical issues

Reply #4 – July 05, 2025, 05:54:24 PM

Thanks for everyones replies. I have got the horn to work by putting a jumper cable where the relay goes. My question is, the relay that goes there does this also have anything to do with the fog lights?? I am getting only 11 volts to the fog light switch is this normal? Obviously the fog lights arent working either. Really starting to do my head in this proble. The temp gage still is intermittent also

Re: Temperature gauge/ Electrical issues

Reply #5 – July 05, 2025, 05:55:07 PM

Quote from: Keekster64 on February 20, 2025, 11:56:42 AM

Your only option is to use the wiring diagram from the Haynes manual and check all the connections for faults using a multi meter. I would be checking for obvious signs of corrosion, for example at the main connection for the fan, as they tend to get corroded with age, and broken wires.

Re: Temperature gauge/ Electrical issues

Reply #6 – July 08, 2025, 01:38:33 PM

I doubt the relay for the horn has anything to do with the fog lights, as that will be a separate circuit. Again, you can only chase down these problems using a wiring diagram to check all the relevant wires and circuits. If you have jumped the horn relay, and the wiring connections are all good, you probably need a new relay. As for 11v on the fog lights, in my experience you do get some voltage drop on the circuits, but that would not be enough to prevent the light from working, it would just not be as bright.

Re: Temperature gauge/ Electrical issues

Reply #7 – July 09, 2025, 08:30:58 AM

Hi Dom,

I've recently (last weekend) had a similar issue when putting mine back together, not exactly the same, but odd things activating and interfering with others. Turned out to be an earth had worked loose off the main earthing distribution block, located near the back of the fusebox. I'd certainly check there.