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How to replace negative battery cable 99 Silverado

How to replace negative battery cable 99 Silverado

Postby Nick51786 [OP] » Jan 15 2015, 5:32am

I believe my negative battery cable is causing my jumping volt gauge. When it's acting up if I mess with it where it goes behind the engine the problem will go away. Now my question is how do I go about replacing it. I can't see where it's connected back there. I see it also runs along the bottom of the radiator. It's just the connection behind the engine I'm having difficulty with. Any help would be greatly appreciated
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Re: How to replace negative battery cable 99 Silverado

Postby j8manski » Jan 15 2015, 5:49am

I would leave the cable. Then rim a cable from any bold on the block, like maybe where a bracket is connected or the alternator, and run it to the battery. Then run another cable from the battery to any spot on the frame, NOT the body. But leave the old wires there.
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Re: How to replace negative battery cable 99 Silverado

Postby Nick51786 [OP] » Jan 15 2015, 7:27am

So I can just disconnect the old negative battery cable and leave it? That sounds way easier then trying to get back there and removing the old one
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Re: How to replace negative battery cable 99 Silverado

Postby j8manski » Jan 15 2015, 7:38am

You can either disconnect it and leave it, or keep it connected and still add your new wires. It can't hurt at all. I have 2 wires going from my alternator to my battery. I was getting headlight dimming with my audio system and also even my blower motor would make my lights dim. I looked under the hood and noticed that all my wiring is all 4 awg, EXCEPT for the alternator to battery wire. That was 10awg or something small like that. So I added a 4 awg wire along side the original wire. That way if 1 gets a bad connection, the other will act as a backup. Also, less current through each wire as they will be in paralell. But it's entirely your call, you can disconnect it and leave it. Cut it as far back as you can to get it out of the way, or leave it hooked up. I say disconnect it or leave it hooked up. My OCD wouldn't allow me to cut it unless I were to replace the wire exactly where it was. From bolt to bolt. That's me though lol
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Re: How to replace negative battery cable 99 Silverado

Postby j8manski » Jan 15 2015, 7:41am

My upgraded wire is my power wire, not the negative wire. Same principle though. Just do NOT hook up a wire from positive alternator bolt to the negative battery post! Haha
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Re: How to replace negative battery cable 99 Silverado

Postby SilverSurfer » Jan 15 2015, 7:50am

Best option is to replace the negative cable with a factory OEM. Second best is to run an a/m cable to the fender (10AWG) and to the block or alternator (4AWG). The second option is actually more of a PITA and the lesser of the 2.
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