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24 Volt 911
Hi
I have a 24 Volt battery charger for my truck, I connected it to my 911 3.0 1975 and stupidly forgot to switch it to the 12 Volt setting for cars. Left it on for a few minutes. The battery checked out fine so it obviously survived. But the same can not be said for the charge system, the car started and ran fine, but it is no longer charging, the red light stays on. I've checked the voltage at the battery terminals both stopped and running and it is lower when the car is running. Any ideas of what the may need replacing, regulator, fuse etc ? Thanks Niall
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1975 911 3.0 Carrera (964 Lookalike Weekender) 1975 911 2.7 (Project) 1979 Ford RS2000 1980 Mini 1275GT 1998 BMW 320i (Daily driver/Reliable Work Horse) |
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04-09-2007, 12:03 PM
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Join Date: Nov 2004
Location: Greater Metropolitan Nimrod, Oregun
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prob. the diodes in the Voltage regulator - that is ext. on a '75
not a whole lot of other sensitive electronics on the early CIS cars so you may be in luck check all light bulbs too
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"A man with his priorities so far out of whack doesn't deserve such a fine automobile." - Ferris Bueller's Day Off |
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04-09-2007, 01:21 PM
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Yeah I changed the voltage regulator for a known to be working unit from a similar car.
Still the charge light does not go out when the car is running and at high revs. Is it possible the alternator is damaged and if so is it an easy fix?
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1975 911 3.0 Carrera (964 Lookalike Weekender) 1975 911 2.7 (Project) 1979 Ford RS2000 1980 Mini 1275GT 1998 BMW 320i (Daily driver/Reliable Work Horse) |
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04-09-2007, 01:56 PM
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Join Date: Jun 2000
Location: N. Phoenix AZ USA
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Diodes in the alternator. Its not a big deal to fix and not that expensive.
How many miles on the alternator? Its probably time to overhaul it and replace the diode pack at the same time.
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2013 Jag XF, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB |
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04-09-2007, 02:07 PM
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- sounds like the diodes are in the alt. & it is the Vreg that is external
I agree you should probably just pull it and take it to an elec. shop
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"A man with his priorities so far out of whack doesn't deserve such a fine automobile." - Ferris Bueller's Day Off |
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04-09-2007, 03:45 PM
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1975 Porsche 911Carrera 3.0L
