Electrical issues - where to start...

J

Jalfrezi

Member
 Bristol
When I bought my car (2003 3.0), it had a parasitic battery drain, as I drove it lots it never became an issue so I lived with it.

About a year later the central locking stopped working, and again I just lived with that.

Then water got into the boot, and my amp blew...

Now I feel motivated to fix these things, and I'm not sure where to start. I'm thinking that the central locking could be the GM5 module, and possibly this could also cause the battery drain. So tempted to get the relays replaced 1st before I do any further work. Does that sound a likely cause, and sensible 1st step?
 
I can replace the relays for you at very reasonable cost which will probably sort your central locking but not your power drain issue - that could be the amp so I would completely disconnect that to eliminate it. If you still have power drain issues you need to start looking at volt drop across fuses to try to isolate the problem. A battery going flat in 3-5 days tends to be some dodgy ancillary item like a gaptech module or an internal light staying on (the centre rear cubby behind the seats is a favourite). Where are you located?
 
Too far for an assist unfortunately, but I can sort your GM5 module if you can remove and post. There are guides on here how to get it out.

I can also have a look at your amp as well if you like but whether or not that is recoverable depends how much corrosion it has on the pcb.
 
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