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Black and Blue
Join Date: Jul 2000
Location: Austin, TX USA - Ya'll
Posts: 2,555
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battery light on at idle...goes out with higher revs
does this mean the alternator is starting to fail? i have a new optima red battery and just had a new voltage regulator installed.
thx
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Kemo 1978 911 SC Non-Sunroof Coupe, two tone Primer Black and SWEPCO Blue, Currently serving as a Track Whore 1981 911 SC Sunroof Coupe, Pacific Blue Project, Future Daily Driver |
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05-27-2009, 04:26 PM
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Registered
Join Date: Jul 2006
Location: Charlotte, NC
Posts: 1,964
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Tighten your belt maybe? (fan belt, not the one on your pants).
Todd
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'81 SC |
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05-27-2009, 04:45 PM
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Northern Motorhead
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Check your battery voltage with an ohmeter... it should read over 14 volts,even at idle !
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05-27-2009, 06:35 PM
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zugelassener benutzer
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that's how mine let me know it was done.
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Team Fee '86 Carrera 3.2 Coupe blk/blk, no wing 7&9x16s BFG GForce SS 205/55 & 245/50s, SW Chip, Maxspeed catbypass, B&B, Sachs Power Clutch, Turbo mounts, oil cooler scoop, RS door panels, Momo Prototipo, Rennline fully adj gas pedal & floorboard, RS replica dead pedal, Weltmeister yellow h/l lenses, factory short shift, custom speedo 32C #7 |
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05-27-2009, 06:52 PM
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Join Date: Apr 2009
Posts: 22
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I would suspect bad diodes in the alternator.
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05-28-2009, 05:15 AM
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EMT/TechRescue Instructor
Join Date: Mar 2007
Location: Moncks Corner, SC
Posts: 342
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Quote:
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David 1986 Iris blue 911 Cabriolet 2017 Ram 1500 Night edition 2025 BMW X-5 |
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05-28-2009, 04:18 PM
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Black and Blue
Join Date: Jul 2000
Location: Austin, TX USA - Ya'll
Posts: 2,555
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great...i just had the alternator out in the rebuild shop... the only thing replaced at that point was the voltage regulator. i guess the rebuilder missed the other. ill check with the voltmeter.
thanks for all the replies.
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Kemo 1978 911 SC Non-Sunroof Coupe, two tone Primer Black and SWEPCO Blue, Currently serving as a Track Whore 1981 911 SC Sunroof Coupe, Pacific Blue Project, Future Daily Driver |
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05-28-2009, 07:11 PM
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Registered
Join Date: Jan 2008
Location: Knoxville, TN
Posts: 43
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My '72 911E has been doing that for five years now. I haven't seen anything change...
Vic |
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05-29-2009, 03:46 AM
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Registered
Join Date: Jul 2003
Location: Back in B'ham, AL
Posts: 3,459
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Depending on the year of the car, alternator brand/type... it could be normal. I recall my 356 doing that all the time - perfectly normal; however not to normal on a 911, based on what you've doen already, check the alternator.
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05-29-2009, 04:08 AM
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Less brakes, more gas!
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Mine has done that for over 10 years... At idle, I get 14+volts at the battery, but the light is bright. I remember reading something about changing the resistance on the bulb when moving to a different style of voltage regulator. This was in a Porsche Factory bulletin. I figured I'd just ignore it for now... that was 10 years ago
 -Michael
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 Michael '82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah '13 Cayenne GTS |
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05-29-2009, 06:50 AM
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1986 Porsche 911 Carrera Coupe 3.2
Ugly Betty
