Intermittant Complete Electrical failure

P38Al said:

Hi, the positive supply to the under bonnet fuse box is tight, no sign of any corrosion etc. I did notice though that the 2 fan relays were very warm. I prised the yellow cover off one, the coil winding was hot to the touch. I've swapped them with the screen heater pair to see if they run cooler. May be a complete red herring! Thanks for all the help so far.

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P38Al said:

Hi Datatek, no sign of any heat damage to the contacts but it does smell like theres a circuit board overheating in the fuse box. Is there anything I can check before buying a new one. I expect they don't come cheap! Thanks again for your help.

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P38Al said:

Thanks Datatek, I've just ordered a replacement. Hopefully it'll arrive before the weekend. I'll let you know what I find when I remove the old one.

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P38Al said:

It's a second hand unit, if it turns out to be faulty too at least I get a full set of relays and fuses ! I'll let you know how I get on.

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P38Al said:

The replacement fuse box has arrived, just realised the diesel and petrol versions have different serial numbers. So my question is what is the difference? Can I use the petrol version in my diesel P38? Connectors underneath look the same, only difference seems to be one of the 'Maxi' fuses. Thanks.

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P38Al said:

Hi all, I've found the cause of the problem in the old fuse box now, the positive feed post had broken away from the circuit board and must have been arcing to get a circuit most of the time. As the second hand fuse box I bought doesn't seem to be the right one I've ordered a new one (part no AMR6477). Hopefully it'll arrive tomorrow and I can get back to business. Thanks all for your help. If anyone needs a 4.6 2001 fuse box in very good condition please let me know.

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