Electrical Faul - Alternator?

Soldato
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Electrical Fault - Alternator?

My car has had an electrical fault for a while, but it was only a problem occasionally, so I've ignored it, but now its getting worse.

Everytime I put some load on the electrical system, everything goes off, radio, dashboard etc. It even sometimes resets the ABS so the light comes on. Its never affected the drive though, the engine runs fine all the time.

This has started happening a lot though, if I indicate with the sidelights on the bloody dash goes off :rolleyes:

My first thoughts were Alternator, but having tested with a multimeter, the voltage never drops below 14v, even with everything on. It does whine a little, as if its working hard, but if it was at fault, surely the voltage would be dropping? Measured across battery terminals, and from the alternator to -ve on the battery and its perfect.

The battery on it is about a year old, and charges up fine, and gives a decent voltage with the engine off too.

Help, I'm very confused, and it needs an MOT before the month is out :(
 
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Sounds like the alternator and battery are fine to me. If the battery isn't going flat then there's nothing wrong with either of them.

Sounds like there's an intermittent fault in there, like a dodgy fuse, a bad connection or a break in a wire. Might be worth pulling the fuses out and checking them all. Also check the connectors that go to the ecu, clean up the terminals etc.
 
Check any wiring loom grounding points to the body, there will probably be a few in the engine compartment and the are a favourite for corrosion.
 
Usually under the fuse box in the wing, if the battery acid has leaked at any point it runs down inside the loom under there and destroys some taped up soldered connections.
However the ones this has happened to have also had running issues.
Yours being only dash related I doubt it's there, but worth starting at the beginning.
 
I chuffing love you all :D

This has been irritating me for ages, and within 8 hours of posting here its fixed :D

Cable from the -ve terminal to the body was knackered, new connector and a bit of wire wool later, sorted :D
 
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