Author Topic: electrical fault  (Read 317 times)

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d7

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electrical fault
« on: June 18, 2009, 09:29:24 AM »
top an tails of it. orange oil light is on ( the orange one) when the ignition comes on and also whilst engine is running, now this is where it gets fiddly you see because the sensor i have tested and is actually working correctly and there is oil in the car and its sending the correct signal to say there is oil in it and even when the sensor is unplugged its still showing light.
now the 2nd half of the fault is that the car is killing any battery within a day of it being stood and not running. its not the coils in the boot draining them as its been tested with how long the battery will last with them plugged into the system and also when the car is just running on normal connections as if no ice is running or in the car at all.

 has anyone had this problem before ?. im currently running through the wiring diagrams seeing where there is any cross overs or connections that share routes or knock on effects to other systems in the cars electronics but as of yet i cannot find any bad earths and there are no lights running inside the car ie the interior or boot light.

Offline slysi16v

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Re: electrical fault
« Reply #1 on: June 18, 2009, 13:44:08 PM »
The oil level switch is probably a switched earth: ie if enough oil then the contacts remain open and no light, if not enough oil the contacts close and allow the bulb circuit to short to earth and the bulb lights up. If the light stays on then sounds like the circuit is permanent shorted to earth. problem is locating it. could be wiring, instrument panel, alternator even. Could be the cause of your flat battery :-\ You gonna need a volt/ampmeter to check the current (amps) drain on the battery (ignition off) and start pulling fuses until the current draw stops (an 'ok' vehicle will generally draw around 30 milliamps [0.030amps]) To drain a battery overnight you will be looking at 1 or 2 amps drain. Once you identify which fuse circuit is draining the system you then have to start unplugging components on that circuit to narrow down further.
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