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High Voltage?

Discussion in 'Chevy Trucks' started by MikeRi24, Nov 4, 2012.

  1. MikeRi24

    MikeRi24 Senior Member
    Messages: 563

    Got in my '99 K2500 7.4 yesterday and it would not start. I got the starter engage click but no crank. The starter, and all power/ground cables in the whole vehicle were replaced earlier this year. I had a hard time believing the problem to be the stater, but I took it out anyway to have it tested (its easy enough). As figured, it tested out fine. I noticed a ton of corrosion on the surface which the stater mounts to the block. Knowing thats how the starter is grounded, I took a lot of time and cleaned it and the corresponding surface on the starter REALLY good. Bolted everything back together and presto it started right up!

    The problem is, I noticed as soon as I started it back up, that the volt gauge was reading really high, like almost to 19 volts. The volt gauge has always read a BIT high, but never more than like 14.5-15.5 volts. I pulled out the multi-meter and checked voltage and got the following results:

    At battery with truck off: 12.56
    At battery vehicle running: 14.56
    At alternator with vehicle running: 14.77

    Seems fine to me? could the gauge just be going bad and its just a coincidence it happened at the same time as the starter? or is there an under-lying cause to all of this?
  2. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,391

    I would say coincident,,,,my old one would go really high then back dwn I would add a gnd at the alt tho