Electrical puzzle

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Topic author
cdm
Posts: 11
Joined: 26/02/21 14:37

Electrical puzzle

Post by cdm »

Hi,

I have a 93 MK2 2.0 NA. It runs well but has just exhibited some weird warning lights on the dash as follows.....

Low Brake fluid - but there is plenty in the reservoir
Discharge - but the alternator is working well with 14.4V when the engine is running
Low oil level - but the dipstick says Full
Engine fan warning - even at low temps.

There is no Engine Management Light and the car starts and runs just fine.

It feels like a connection or earthing problem but I can't see the common link to these sensors.

Any suggestions would be gratefully appreciated.

Thanks for your help.



Topic author
cdm
Posts: 11
Joined: 26/02/21 14:37

Re: Electrical puzzle

Post by cdm »

Update....

Problem solved. In case any of you ever see this thing again....

It was actually the 3-way plug to the alternator that was making a poor contact. The clue that lead me there was the wiring diagram that showed the Discharge Light on the dash connected to the L terminal of the alternator.

Plugged in in firmly and the problem is gone.

Result!
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Re: Electrical puzzle

Post by jimi »

Well done for sussing it out. :th:
Because of the way the circuit works (it basically monitors the voltage difference between the battery voltage and the alternator output voltage) the charge warning light can be a handy diagnostic tool.
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Khoc
Posts: 17
Joined: 04/04/21 14:24

Re: Electrical puzzle

Post by Khoc »

20210505_145406.jpg
cdm wrote: 23/03/21 13:45 Update....

Problem solved. In case any of you ever see this thing again....

It was actually the 3-way plug to the alternator that was making a poor contact. The clue that lead me there was the wiring diagram that showed the Discharge Light on the dash connected to the L terminal of the alternator.

Plugged in in firmly and the problem is gone.

Result!
Been having charging problems myself. Finally managed to get the 3 pin plug off and it was all dirty with white deposits. But now when I put it back on it feels very loose!!! It's all done by feel. Did you feel it click back into place or is there a latch on the plug?
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