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Alternator not charging. 1984 Chevy Silverado

Alternator not chargine. 1984 Chevy Silverado 5.7L Replaced alt., battery, & starter. Altenator has power at rear post, and on terminal on top, other should have key switched power, and does not....Any ideas? thomas.carluccio@gregpoole.com

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6ya6ya
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Posted on Jan 02, 2017

  • 9 Answers

SOURCE: 1988 chevy suburban charging system

First check alt At The Back of Alt Big Red Wire Were hooks to Post (stud) Do you have voltage ?? How Much??
What Voltage do you have at same Place with Engine Running ??
Now At wires Were they plug into Alt ,Top. Wires in White Plastic Clip, Do You Have Powe With Key On ?? How Much Voltage??
Jump across the 2 in the clip (with Engine Running)ONLY TEMPORARY!! Do You Have Voltage at Battery ?? How Much??
If Over 13volts With Clip On (Jumped) You Need A Internal Voltage Regulator ..
Is Batt Light On on Dash ??? Theres A Lot Of Testing You Can Do !!! And I will Need More Infomation to Keep Going ... These are just some Possible Problems No Way In Depth ...
Could Be a Number of things Or May be Just as Simple As a Blown Fuse, Dirty Batt Cables ETC etc etc I Hope It Puts You On The Right track !!!!!!!!!!

Posted on Jan 07, 2009

  • 3 Answers

SOURCE: My 1993 Chevy Caprice Wont Start

there are large fuses in the relay box it could be one of these located in the engine compartment

Posted on Mar 18, 2009

  • 6 Answers

SOURCE: 350 Chevy starter wiring diagram needed

IF YOU HAVE A POINTS TYPE DISTRIBUTER, THE WIRING WILL BE: TO ENERGIZE THE STARTER SOLENOID A LARGE, ABOUT A NUMBER 12 OR 14 GAUGE WIRE WILL GO TO THE INNER MOST SMALL TERMINAL ON THE STARTER SOLENOID. IT MAY BE PURPLE IN COLOR. THE SECOND SMALLER WIRE SHOULD GO TO THE OUTER SOLENOID TERMINAL AND GO FROM THERE TO THE + TERMINAL ON THE IGNITION COIL. THIS IS FOR BY PASSING THE RESISTOR WIRE FROM THE STARTER IGNITION SWITCH. THE LARGER BATTERY CABLE WILL GO TO THE UPPER TERMINAL ON THE STARTER SOLENOID. THERE MAY BE AN ADDITIONAL BATTERY FEED WIRE TAKE OFF FROM THE STARTER BATTERY TERMINAL POST ON THE SOLENOID FOR OTHER ACCESSORIES. THIS TYPE OF SYSTEM (POINTS TYPE) WAS TYPICALLY DONE AWAY WITH IN 1975 WHEN THE HEI DISTRIBUTOR CAME OUT.

Posted on May 05, 2009

  • 6 Answers

SOURCE: charging problem , alt good , works when ground out terminal on back

voltages regulator or relay switch is bad

Posted on Jun 04, 2009

  • 173 Answers

SOURCE: Chevy G20 1985 wiring (charging problem)

http://wareznuke.com/apps/3872/all-1979-2007-vehicle-wiring-diagrams-v42-rapidshare-warez


Posted on Jul 08, 2009

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1 Answer

Why do i lose voltage intermittently from the alternator when i step on the brake ?


what engine size?
the PCM runs the show, and its bad. or wires bad to it.
your car has PCM regulator.
no charge battery light.?

1: takes a good battery and battery cables and lugs cleaned.
2: test the altenator, odd how 4 of yours all tested good but you replaced it 4 times, get it tested if good, its good.
3: then check that the charge .battery lamp works. if the lamp works
that means the PCM thinks that charge system is bad.
if the wires from the rear of the alt, to the battery red and Gy wires
are good all the way to PCM then the PCM is bad.
the big wire on rear of ALT , on one car had a bad lug. #6 wire.
he replaced the ALT 6 times. all wasted effort.
inspect the wiring first. that is free, and is simple fix.
and if the ALT casing is not grounded, all bets off.
same with battery minus lug not good, on BOTH ENDS>
one guy had his battery lug moved to frame, (wrong)
and this never worked.

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The red wire goes to the lug on the back of the alternator (B+ connection) You need to run another wire from that terminal directly to the battery. Normally, the remainder of your power accessories will be attached to the starter main terminal but you could run that from the battery as well since that's the other end of the same wire. I wouldn't use the alternator terminal for that only because the insulator on the terminal could overheat and melt if overloaded for any reason. In any case, everything except the wire between the battery and alternator should pass through the ignition switch so it's all off when the key is off.

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A bad voltage regulator could cause the problem. Assuming the alternator is working correctly. Jump the vehicle with the battery disconnected and then disconnect the jumper cables. If the vehicle dies your voltage regulator or Alternator are bad, some vehicle have separate regulators from the alternator, if it continues to run the alternator is good but the voltage regulator is probably the cause.

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2 Answers

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