Wire gauge size for Alternator to GMPP main post - Team Camaro Tech
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post #1 of 42 (permalink) Old Jan 2nd, 18, 05:35 PM Thread Starter
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Wire gauge size for Alternator to GMPP main post

You guys use 8ga wire from the alternator to the GMPP main lug for charging ?? Maybe a 3 1/2 foot length.

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post #2 of 42 (permalink) Old Jan 2nd, 18, 05:50 PM
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Post Re: Wire gauge size for Alternator to GMPP main post

Are you talking about the wire on the alternator (stud)? I just ran it to the starter. Many have done it that way with out any issues. What alternator are you using?

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post #3 of 42 (permalink) Old Jan 2nd, 18, 05:51 PM
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Re: Wire gauge size for Alternator to GMPP main post

I am not a wiring guru but I would not wire it that way. I do alternator to starter to battery and then battery to GMPP.

Like I said, not a guru. Iím sure one will respond.

Don
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post #4 of 42 (permalink) Old Jan 2nd, 18, 05:52 PM
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Re: Wire gauge size for Alternator to GMPP main post

Don, I wired mine the same way.

Chris
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post #5 of 42 (permalink) Old Jan 2nd, 18, 05:55 PM
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Re: Wire gauge size for Alternator to GMPP main post

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Don, I wired mine the same way.
Then I guess youíre not a guru either Chris...

Don

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post #6 of 42 (permalink) Old Jan 2nd, 18, 05:59 PM
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Re: Wire gauge size for Alternator to GMPP main post

Yeah, Don but it has been good for the last 10k miles though LOL

Chris
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post #7 of 42 (permalink) Old Jan 2nd, 18, 06:03 PM
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Re: Wire gauge size for Alternator to GMPP main post

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Yeah, Don but it has been good for the last 10k miles though LOL
Gurus donít actually drive their cars, they spend all their time on forums...

Don
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post #8 of 42 (permalink) Old Jan 2nd, 18, 06:15 PM
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Thumbs up Re: Wire gauge size for Alternator to GMPP main post

Donny, on a serious note I am running a corvette 145 amp alternator on mine with a 8 gauge wire going from the alternator stud to the starter. If I did it again I would probably run a 4 gauge wire. The problem most have is keeping voltage higher when you are under a load (AC, both fans on and all of the car's electronics going). I start out at 14.0 volts (no load, just starting). It gets down to around 12.5v with everything going and that seems to be the norm with the GM style alternator (mine and other LS swap buddies). I am getting ready to replace my current C5/Holley serp setup with the new Holley Mid Mount system. I like it because that alternator (same as a Mech Man type) puts out about 100 amps at idle. I will be upgrading to 4AWG wire when I do. Hope this helps you. If you know of anyone looking for an awesome LS serp setup, send them my way. Nothing wrong with the old stuff, I am just a victim of the shiny object syndrome LOL

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post #9 of 42 (permalink) Old Jan 2nd, 18, 06:39 PM Thread Starter
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Hmmm, now I'm totally confused. (Don't take much) I thought most guys are running the charge wire from alternator to main lug on the GMPP fuse box with a fusible link??? I'm using the Holley acc drive, the alternator is a 130 or 140 amp.

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post #10 of 42 (permalink) Old Jan 2nd, 18, 07:01 PM
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Re: Wire gauge size for Alternator to GMPP main post

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Hmmm, now I'm totally confused. (Don't take much) I thought most guys are running the charge wire from alternator to main lug on the GMPP fuse box with a fusible link??? I'm using the Holley acc drive, the alternator is a 130 or 140 amp.
You will not get optimal filtering and spike absorption from the battery doing it that way. Run your GMPP fuseable link to the battery.

Might be best for you to post a wiring sketch for folks to look over.

Don

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1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
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post #11 of 42 (permalink) Old Jan 2nd, 18, 07:24 PM
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Re: Wire gauge size for Alternator to GMPP main post

Donny, this is how my GMPP harness is wired (in regards to this situation). My battery is mounted in the trunk.

Battery - GMPP fuse panel 8 AWG (with fusible link)
Battery - Starter 2 AWG
Alternator (stud) - Starter currently 8 AWG (would recommend 4 AWG though).
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post #12 of 42 (permalink) Old Jan 2nd, 18, 07:32 PM Thread Starter
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Thanks guys, I actually got the wire info from Jeff (24/7) build thread. He ran his alt charge wire to the gmpp main lug. Ok so I will just go from alt to starter lug than. This does make more sense to me now. My batt cable is 1/0. That's seems better than an 8 gauge wire going back to the trunk for charging the batt
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post #13 of 42 (permalink) Old Jan 2nd, 18, 07:50 PM
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Re: Wire gauge size for Alternator to GMPP main post

There is more than one way to do this and each has its merits. I can only tell you what I did and why.

Make sure you do not connect your fans to that same 8 gauge wire that is feeding the GMPP block. They draw a lot of current....

Don
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post #14 of 42 (permalink) Old Jan 3rd, 18, 02:30 AM Thread Starter
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Re: Wire gauge size for Alternator to GMPP main post

Battery in the trunk with solenoid. I'm running an 8gauge wire from solenoid (hot all the time and on same lug as battery) with fusible link to GMPP main stud. Switched side of solenoid is my 1/0 battery cable to starter.

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post #15 of 42 (permalink) Old Jan 3rd, 18, 04:49 AM
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Re: Wire gauge size for Alternator to GMPP main post

Iíve never understood why guys use those solenoids. I always look to the OEMs for cases like these. The 5th gen SS Camaros with trunk mounted batteries donít use solenoids. The battery cable goes through the cabin unprotected by a solenoid and connects to a bulkhead in the engine compartment. If it is good enough for GM it is good enough for me....

Again, not a guru.

The more parts and complexity you use in a system the less reliable it will be.

Don

1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
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