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  1. #1

    Default low voltage please help

    please help my voltage is lowering from 14 to almost nine as i turn on accesories i have replaced the alternator ,battery,comp,ignition coil ign module cap,rotor plugs wires and temp sensor any suggestions would be greatly appreciated the vehicle is a 91 k1500 ext 5.0 305 4x4

    p.s.the idle surges when the voltage is low any help would be much appreciated i dont want to buy a new truck

  2. #2
    Jr. Mechanic SoundZman's Avatar
    Join Date
    Apr 2009
    Santa Clarita, CA


    You seemed to cover pretty much everything, except, replacing battery cables. I would replace the alt to battery cable, battery to chassis & chassis to block wires to be safe. It sounds like you might have a poor contact point that causing your problems. Make sure you clean the contact point at all location REALLY good, I also use that battery terminal grease, even on the chassis locations to help with corrosion/rust.

    Also, theirs no problems with adding additional ground point like firewall to chassis to help with ground loops and things like that. Being that it's a '91 you could have some pretty worn and aged wiring.

    ---------- Post added at 09:39 PM ---------- Previous post was at 09:38 PM ----------

    that's funny, I didn't see how old your post was until after I posted myself...I saw it come up as "similar" post to something else I was posting on....
    >>>2003 Suburban K1500 LT<<<

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