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#1
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74 Ventura
Bone stock, 350 Pontiac 2bbl with AC. OK...
My theory: 1. Igition coil breaking down ( car sat for 10 years) and causing excessive current. 2. Movement of engine under hard load causing ground issues? I am open to ideas or a better undertanding of the function of the alternator light. [ my understanding is, the guage fuse supplies voltage to "idiot" light which in turn provides excitement voltage for the alternator] Thanks. |
#2
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I'd start by checking your wiring harness very carefully, sounds like you've got an intermittent dead short in the circuit that fuse protects, likely happening with the movement caused by hard acceleration.
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#3
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I also would say a circuit short when accelerating. Engine may be shifting in mounts and pinching a wire someplace.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum |
#4
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I also considered critters have gotten in somewhere.
Thanks for the input. |
#5
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I don't know if it would cause your problem or not but check the routing of your positive battery cable. If it only happens under heavy throttle maybe you're pinching the cable under the oil pan to the frame???
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#6
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A bit puzzling, but the alternator should be putting out 14.2 volts, not 13.7 volts. Could be a problem in the regulator. Have you looked in the distributor? It's possible that when the advance kicks in a short is created momentarily that causes your problem. I'll check back later to see how you are progressing.
FHummel |
#7
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Possibly the regulator...curious if you have a voltmeter that you can connect when running up the RPMs. Any chance the output voltage is going way high when RPMs climb?
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1968 Firebird IAIIa 522 340 E-heads Northwind with XFlow TBI 4L80E 3.50:1 Rear 1969 Firebird 350/TH350 Mostly stock 2.56:1 Rear ![]() |
#8
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This may help you understand what's happening.
http://www.madelectrical.com/electri...witworks.shtml You can disregard your first theory. My theory: 1. Igition coil breaking down ( car sat for 10 years) and causing excessive current. The ignition circuit is on a different branch of the harness and if something shorted directly to ground (not like the points which are an intermittent short to ground) it would be cause the fuseable link to blow which would shut everything off. You didn't mention if you have guages or warning lights. Does it have tachometer? Not having seen your car, has someone added electrical load to the guage circuit? Since the guage fuse is blowing the problem will be in the circuit after the fuse. Some part of that circuit is going to ground and overloading the fuse. The generator light may just be a symptom of the fuse blowing and not part of the problem. I'm not as familiar with your year of car as I am with the earlier years. So I can't say with certainty how the alternator light is wired and what causes it to light.
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If it breaks. I didn't want it in the first place. _____________________________________________ 69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN. |
#9
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#10
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I suspect that the IP fuse blows for some as of yet undetermined reason, but there is still a parallel path to ground on the supply side of your alternator light. My guess is your instrument cluster is shorting out somewhere, blows the IP fuse, but the ground that blew the fuse is allowing power to back feed from the alternator, through the light, and to ground. Maybe pull your cluster and check your PCB - that flimsy collection of laminated copper strips that separates after 50 years. All your instrument cluster bulbs plug into it.
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