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Topic: Charging Light

in Forum: C3 Electrical

Charging Light

Posted: 11/24/09 8:38pm Message 1 of 7
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Rocklin, CA - USA
Joined: 4/2/2005
Posts: 484
Vette(s): 1970 T-Top350/350hp numbers matching 4 speed. It's a mess and 1970 Convertible 4 speed.
This is on the 81. I drove the car in the dark for the first time and notice that the lights at a stop light go dem.  The voltage gage would charge past the mid point when taking off then at a stop drop to the neg. I will take the alt off and get get it check. But if that is not the problem what would cause the problem?


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Charging Light

Posted: 11/24/09 9:01pm Message 2 of 7
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HOWELL, NJ - USA
Joined: 5/18/2004
Posts: 6812
Vette(s): 1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.
Sounds like a tired alternator to me....


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Charging Light

Posted: 11/25/09 4:49am Message 3 of 7
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Kendall Park, NJ - USA
Joined: 3/9/2005
Posts: 789
Vette(s): 1981 - 59 Beige over Cinnebar leather. Edlebrock top end, 2200 stall w/shift kit, 3:55s, Mufflex maniback exhaust, nice stereo, 16 in AREs w/BFGs
Just had same issue on my 81.  Bad alt did it.


Charging Light

Posted: 11/25/09 11:06am Message 4 of 7
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Oak Creek, WI - USA
Joined: 5/21/2008
Posts: 1965
Vette(s): 1981 Great White Shark. Red Interior, 350/190 hp. PS, PB (SS), A/C CC, T-Tops. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vettes Car Club. 175,000 Original miles!! Now own a 1998 C-5!
All of us 81 owners agree, "The Alternator did it" !!
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Charging Light

Posted: 11/25/09 11:34am Message 5 of 7
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Of course, check all of the battery connections, including the ground cable under the seat(on the frame), and the ground from the frame to the engine block by the starter.
The alt is the most likely culprit, for sure, but be certain to check/clean/tighten the battery connections, too.



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Charging Light

Posted: 11/25/09 9:37pm Message 6 of 7
Former Member
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Rocklin, CA - USA
Joined: 4/2/2005
Posts: 484
Vette(s): 1970 T-Top350/350hp numbers matching 4 speed. It's a mess and 1970 Convertible 4 speed.
Ok its not the alt. Had it check and it check ok. The neg cable is ok I replace it 2 weeks ago. I am having some problem with the positive cable. Next I will take the battery off and have it check. I believe its the battery.  On the positive side I don't think its getting a good tight connection I can never get the bolt to be tight. I can turn and turn the bolt and it does not tight.


Charging Light

Posted: 11/29/09 8:38am Message 7 of 7
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Rocklin, CA - USA
Joined: 4/2/2005
Posts: 484
Vette(s): 1970 T-Top350/350hp numbers matching 4 speed. It's a mess and 1970 Convertible 4 speed.
Hey replace the battery the car does not cut out Tongue thats good.  But, the lights still to seem to go deem? I notice that the electrical gage needle stays at 13 when stop and goes positive when I take off. I check with a altimeter and it read 12.22 at idol and 14 when I rev it up. Is this normal?


in Forum: C3 Electrical


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