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Diagnosing an electrical short (fuse blowing)

T

tref

PCGB Member
Member
Gentlefolk,

This is the kind of fault that is teh bane of my life... The fuse is blowing for the central locking, so there is a short somewhere... trouble is, how do you determine where the fault is, short of disconnecting as much of it as possible, and gradually plugging it all back in until the fuse blows again? I thought of sticking a light bulb in in place of/as well as a fuse to mean that it shouldn't blow, but that doesn't help me find the fault... I guess I could put a multi-meter on the shorted side of the fuse holder and determine by resistance when I eradicate the fault, just wondered how other people tackle such a problem.
 
1st thing id check is where the wiring feeds from the door frames to the body, in the past had a rover that chewed up the wiring at the door and kept shorting. Insulation had split on a couple of wires and as im a lazy cheapskate I just taped em. Problem fixed for as long as I owned it.
 
It is where I am expecting to find a problem yes. Assuming I cannot see it, it is proving which part of the circuit it is in (drivers door/passenger door, or elsewhere) that I am interested in...
 
As you said .. dismantling as much as necessary to find the fault ...

Isolating sections of the circuit is a good way forwards. So, if you can, unplug each door at a time and see if the short is in that bit of the circuit.

The good news is that the central locking on a 944 doesn't comprise much; two doors, and the wiring between them and the control unit (clipped onto the bottom of the steering column.)

Happy hunting. You may be some time.


 
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