Problem with electrics

Nov 12th, 2002, 08:02

I have problem with the electrics on my 1989 240 GL estate, it keeps blowing fuses for the day running lights and main fuel pump and has now started on the fuse for the dashboard lights as well, the alternator light glows dimly when the engine is running, the alternator is only about six months old. Any suggestions please?

andykem · Nov 16th, 2002, 21:02

When I had a problem last year with blowing bulbs on my 1980 262, it was the voltage regulator. Without the vr working the alternator was delivering 18+ volts. But in that case fuses did not blow, although the alternator light came on when the engine was stopped and ign off, because the circuits were passing to earth thru the regulator diodes.

Also, my original vr was a separate unit from the alternator. I now have an alternator with the vr built in. It may be that the regulator pack in the alternator can be replaced separately.

Think I would check the alternator volts first and also check for any short cicuits pretty well anywhere.

Peter Milnes · Nov 17th, 2002, 00:41

Make sure that there is an earth strap from the alternator casing to the engine block. This has caused problems for alternators on 700/900 series. Alternator output volts should be 14 - 14.5 Volts.

To replace VR remove two screws and withdraw regulator unit (with brushes). Replace with comparable unit complete with brushes.

All the best, Peter.

Nov 12th, 2002, 08:02	#1
tiny Guest Location:	Problem with electrics I have problem with the electrics on my 1989 240 GL estate, it keeps blowing fuses for the day running lights and main fuel pump and has now started on the fuse for the dashboard lights as well, the alternator light glows dimly when the engine is running, the alternator is only about six months old. Any suggestions please?

Nov 16th, 2002, 21:02	#2
andykem Member Last Online: Mar 10th, 2020 12:16 Join Date: Jan 1970 Location: cheltenham	RE: Problem with electrics When I had a problem last year with blowing bulbs on my 1980 262, it was the voltage regulator. Without the vr working the alternator was delivering 18+ volts. But in that case fuses did not blow, although the alternator light came on when the engine was stopped and ign off, because the circuits were passing to earth thru the regulator diodes. Also, my original vr was a separate unit from the alternator. I now have an alternator with the vr built in. It may be that the regulator pack in the alternator can be replaced separately. Think I would check the alternator volts first and also check for any short cicuits pretty well anywhere.

Nov 17th, 2002, 00:41	#3
Peter Milnes Premier Member Last Online: Apr 10th, 2014 00:01 Join Date: Feb 2002 Location: Tonyrefail	RE: Problem with electrics Make sure that there is an earth strap from the alternator casing to the engine block. This has caused problems for alternators on 700/900 series. Alternator output volts should be 14 - 14.5 Volts. To replace VR remove two screws and withdraw regulator unit (with brushes). Replace with comparable unit complete with brushes. All the best, Peter.

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