Electrical short - Key on - All Fuses out??
05-18-2004, 02:39 PM
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Electrical short - Key on - All Fuses out??
My '73.5 911T is having electrical problems. I start it and it will die in about 5 minutes from a dead battery. Shut it off, the batteries recover in about 5 to 10 minutes and it starts up and repeats the sceario. Sooooo, I pulled all the fuses and it still happens. Also, when it does run, the alternator is not charging the batteries. Voltage stays at about 11.8. If I just tun the key on and don't start the car, same thing happens. I guess I have a serious short.
Could it be in the Alternator itself? Should I pull the Alt/regulator and have them tested. Is the regulator with the alternator or located elsewhere? When I remove the pulley on the fan, I need to lock it from turning. I've been advised to put a tool or screwdriver in one of the small holes, Is there a hole behind it to lock into, or do I just put a screwdriver thru it and turn it till is locks onton something? Any advise appreciated....Thax...Bob S.
Could it be in the Alternator itself? Should I pull the Alt/regulator and have them tested. Is the regulator with the alternator or located elsewhere? When I remove the pulley on the fan, I need to lock it from turning. I've been advised to put a tool or screwdriver in one of the small holes, Is there a hole behind it to lock into, or do I just put a screwdriver thru it and turn it till is locks onton something? Any advise appreciated....Thax...Bob S.
Last edited by LakeCleElum; 05-18-2004 at 03:53 PM.
05-18-2004, 03:35 PM
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The best way is to trace the flow with an ammeter, but you are talking serious flow here and I bet you are right about the alt. probably one or more blown diodes. Suggest isolating the alt and checking draw at battery again. Good luck.
05-19-2004, 12:45 AM
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Thax much Dave......I read up on the removal process on the internet and now have it out.....I no longer have a drain with the key on now that the is Alt. removed....It's off to the Auto Elect. Shop....Thax again...
05-21-2004, 12:37 AM
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Lake, you should never try to charge the battery with the alternator. Always start with a fully charged battery or you'll put too much stress on the alternator.
05-22-2004, 10:43 PM
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Have had the alternator "rebuilt" and install and new regulator. Problem still persists....Battery discharges quickly will all fuses removed and all accessories off.....I'm thinking a bare wire somewhere in the battery/charging circuit....