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Registered
Join Date: May 2004
Location: UK
Posts: 39
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Overcharging Alterntor on Porsche 911t 1974. Help needed
hello
I have a 1974 911T engine 2.7L. that i have just fitted into the back of a 1953 VW campper van. a few problems , 1 i cant seem to know the answer to. The charging light goes dim when started up, using a voltmeter the engine charges upto 18-19V when reved up to 3000rpm approx. This seems way to much. The battery is charged and in good order. The regulator is brand new today (replaced today). Any ideas? thanks Paul.grice@jpmorgan.com
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1953 Barndoor T2 1955 Rag T1 Oval 1959 T1 Vert project- prob wont get done! 1985 Carerra, Targa |
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06-18-2004, 09:46 AM
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You should have a marchel alternator in there. There are some wires inside the alternator (I think the call them feilds) That are rubber coated and held by these metal stands. When the rubber dry rots and erodes the wires then ground out causeing overcharging. (this is what my alternator guy told me ;I have 2 marchels in my cars) I think it is time for a rebuild about a 100 bucks by someone that knows them
Ben |
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06-18-2004, 09:55 AM
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Join Date: Dec 2002
Location: santa cruz
Posts: 185
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paul,
sorry I can't help w/ your question but I can tell you that I'm pretty sure there was no 911t 2.7 I think the last 911t was 1973 w/ a 2.4 |
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06-18-2004, 09:55 AM
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Join Date: May 2004
Location: UK
Posts: 39
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hello
thanks for the replies, particularly the alt help, thats very handy and v. useful. cheers! The engines definetly a 2.7L from 1974, i checked the serial number in a book. I think it was fitted with CIS injection, its now running carbs! need to get it charging , then i can race it cheers all
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1953 Barndoor T2 1955 Rag T1 Oval 1959 T1 Vert project- prob wont get done! 1985 Carerra, Targa |
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06-18-2004, 10:02 AM
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Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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Paul,
Either the regulator is bad, mismatched to the brand of the alternator, or somehow miswired ... The alternator was originally a 770 Watt Marchal [M16 threads on the shaft] or Bosch [M14 threads] ... so you need to confirm that the new regulator is appropriate for the unit! Anything above 14.5 Volts will cook the battery and possibly damage other parts in the electrical system ... radio, halogen bulbs, etc.
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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06-18-2004, 10:05 AM
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Registered
Join Date: May 2004
Location: UK
Posts: 39
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HELLO
thanks for the adivce, much appreciated. I took out the Alternator yesterday, reasling that it is the Motorola SEV unit, i was running it with the Bosch regulator. I checked the Alt, seems ok, so im gonna get the correct Regulator today, hopefully i havent fried anything.....! hope so, anymore help is appreciated. Do u think this will sort my overcharging? and ever so dim light on the dashboard? thank you !
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1953 Barndoor T2 1955 Rag T1 Oval 1959 T1 Vert project- prob wont get done! 1985 Carerra, Targa |
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06-20-2004, 11:32 PM
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