Question about 1995 Chevrolet K1500

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1995 Chevy K1500 Electrical Problem

When I have the truck running the Voltage Reads 13.9 volts with the headlights on and the blower motor on. But when I put the truck into gear the voltage drops down to just above 12 volts and stays there, and if i turn off the headlights or the blower the voltage only rises up a little bit. This problem just started happening out of nowhere. I have replaced the alternator, battery, ground wires (cleaned the surfaces to bare metal), power cables. The battery and alternator have been tested and are both in excellent condition. I'm getting frustrated with this problem! What would be causing this?

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  • drifterlocus May 05, 2009

    Gauge reading 13.9 and goes down when headlights and blower is turned on. Replaced altenater and battery and still doing it, also the volt gauge and fuel gauge move around like I have a loose ground and the volt gauge moves in time with the turn signals.

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6 Suggested Answers

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Posted on Jan 02, 2017

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GM Elec
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SOURCE: possible voltage regulator problem on alternator

Disconnect the battery, disconnect the red wire on the alternator stud, disconnect the (2) wire connector on the alternator. Reconnect the battery, turn the ignition to the run position, check both red wires and the brown at the alternator and make sure there is voltage on all wires.
Per your description, I believe you will not have voltage on one or both of the large red wires.
Let me know.
Regards,

Posted on May 09, 2009

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  • 6982 Answers

SOURCE: Charging system malfunction under load

If the condition is present for short times only it will not affect anything. It's possible that the crank pulley is glazed and slipping slightly on a hard pull (everything else depends upon that pulley to be properly driven) You can't really duplicate that on a static test. It's also possible that the battery was a bit low when you bought it and needs to have the charge level topped off with an external charger. Otherwise, the only option I can think of offhand would be to obtain an alternator designed for heavy duty service (police version etc) which may be able to deal with the demand.
As your vehicle gets older, resistance in all circuits increases, making little difference during normal operation but can also influence how your vehicle charges. Cleaning / adding additional ground points can help with this.
If it seems that I'm jumping around a bit, I am, but since the charging system is pretty much operational except at that one point, I'm trying to give you some ideas that either in combination, or one alone will be of some help to you.
good luck

Posted on May 25, 2009

  • 6 Answers

SOURCE: 84 CK TRK, 2500, 5.7L 55,000 miles have replaced

On some of the older style GM's you can take that brown wire and cut it and take the end leading from the alternator and hook it directly to the hot terminal on the alternator and just leave it hooked up and it will work. But I have ran into the occasional problem where leaving it hooked up will drain the battery when the vehicle isn't running. Hope this helps..

Posted on Oct 25, 2009

Testimonial: "I fixed the problem - the terminal at the brown wire was corroded - after cleaning and recrimping - everything works - thanks for the heads up"

ftw1952
  • 10319 Answers

SOURCE: 1993 chevy 1500 p/u. Alternator only placing 12.5

13.5 is what it should be at all times not 14.5 so the regulator is not functioning correctly . Reversing the probes on the volt meter will tell you the doide is bad if the reading is showing the same results as properly connected

Posted on Jun 15, 2010

duane_wong
  • 6826 Answers

SOURCE: 1995 k1500 pickup,replaced battery and

]Bad starter probably.
I would replace it.

Posted on Jul 04, 2010

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