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Non Start, Alternator Hot


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11 replies to this topic

#1 weazel134

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Posted 16 July 2017 - 04:09 PM

So just went to start the car up. Lazy to turn over until then nothing. Been out this morning for a long run so battery shouldn't be flat. No lights or anything left on. Had a look round engine and noticed that the alternator was hot. Any ideas? Ford zetec black top. GBS zero.

#2 RichardL

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Posted 16 July 2017 - 05:53 PM

Worth sticking the battery on a charger (which shows condition) - i.e. to discount battery vs. wiring/earths?


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#3 IanS

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Posted 16 July 2017 - 06:06 PM

Hot alternator after engine stoped enough to cool down is almost certainly the diode pack having a short.

Auto electrician should be able to repair, but a new replacement might not cost much more.



#4 weazel134

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Posted 16 July 2017 - 07:03 PM

So I thought I'd just try something. Reconnected the neg terminal (disconnected earlier to stop alternator getting hot) and the alternator gets hot again. Are you pretty convinced that it'll be the alternator? What else could I check to eliminate anything else?

Thanks.

#5 cb750

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Posted 16 July 2017 - 07:42 PM

As above, I would say that confirms that the alternator is drawing the current. Thats a faulty diode in the alternator.

#6 weazel134

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Posted 16 July 2017 - 07:44 PM

Alternator now. Off to a local auto elects tomorrow. Top work guys. Will update when I know if it cured the fault.

#7 mcramsay

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Posted 16 July 2017 - 08:33 PM

To be honest I would be pretty chuffed with my self for finding that fault straight away! One of those faults you could spend ages pulling fuses to find the faulty circuit!

#8 weazel134

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Posted 16 July 2017 - 08:37 PM

I do hope you're right, if it's down to the alternator it thanks to the knowledge on here. Fingers crossed

#9 weazel134

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Posted 17 July 2017 - 06:23 PM

Ok, so had the alternator tested today. All working ok. Charged the battery up. Time for some more checks. Gin relay, wiring to alternator etc.

#10 samss

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Posted 17 July 2017 - 11:21 PM

If it's getting hot, something is going on! If the alternator has been tested and the diode pack is okay, what about the 12v ignition feed, is that correctly wired as per however that alternator is meant to be wired through the bulb or however it's meant to be? Could that be permanently receiving a feed for some reason?



#11 weazel134

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Posted 18 July 2017 - 08:50 AM

Put everything back together and so far everything seems to be ok. Can't fault it now. The only thing I remember doing differently was to try and use the key and turned to the start position instead of using the start button. When I used the key to try and start, obviously it didn't start but the battery warning light goes out so something is maybe still connected.

#12 RichardL

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Posted 18 July 2017 - 10:27 AM

May be you corrected a marginal connection fault in the re-wiring/re-assembly?
(Things fixing themselves is not ideal)


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