Aftermarket Standalone harness vs GMPP - Team Camaro Tech
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post #1 of 11 (permalink) Old Dec 11th, 16, 09:05 AM Thread Starter
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Aftermarket Standalone harness vs GMPP

I was trying to compare the stand alone engine harnesses between aftermarket (PSI and the like) and the GMPP. I think I like the GMPP harness better. The GM fuse box appears to be much larger than the aftermarket ones and I like the battery lug that is on the GMPP to ease battery connection. Are the aftermarket harnesses just as easy to connect the alternator and battery ? Anyone offer any doubts ,thoughts, concerns ?? Thx

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post #2 of 11 (permalink) Old Dec 11th, 16, 09:16 AM
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Re: Aftermarket Standalone harness vs GMPP

I have used both and I like both equally.

The GM is larger and the 2 added lugs are handy for running AC and Fans. I mount in the battery tray and move the battery to the trunk.

PSI is nice if you want to mount the ECM inside the car.

For me if I do a crate LS I go with GMPP. If built motor PSI.

My buddy just used a GMPP in an LSX swap and happy with it. Hasn't run the car yet.

PSI you get a used ECM. GM you get new.
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post #3 of 11 (permalink) Old Dec 11th, 16, 09:34 AM Thread Starter
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Re: Aftermarket Standalone harness vs GMPP

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Originally Posted by Vega$69 View Post
I have used both and I like both equally.

The GM is larger and the 2 added lugs are handy for running AC and Fans. I mount in the battery tray and move the battery to the trunk.

PSI is nice if you want to mount the ECM inside the car.

For me if I do a crate LS I go with GMPP. If built motor PSI.

My buddy just used a GMPP in an LSX swap and happy with it. Hasn't run the car yet.

PSI you get a used ECM. GM you get new.
Thank you John. I guess no big deal really without the lugs.

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #4 of 11 (permalink) Old Dec 11th, 16, 10:01 AM
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Re: Aftermarket Standalone harness vs GMPP

I use this terminal block wth a fusible link from the battery or starter lug

JEGS Performance Products 10521K: Terminal Block & Bus Bar Kit Includes: Terminal Block 555-10521 | JEGS
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post #5 of 11 (permalink) Old Dec 11th, 16, 11:54 AM Thread Starter
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Re: Aftermarket Standalone harness vs GMPP

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Originally Posted by Vega$69 View Post
I use this terminal block wth a fusible link from the battery or starter lug

JEGS Performance Products 10521K: Terminal Block & Bus Bar Kit Includes: Terminal Block 555-10521 | JEGS
Thanks again John. So I would go from trunk (batt in trunk) direct to one of the lugs on the Jegs bus bar, and then from the bus bar to the starter I take it ? The pos batt cable from trunk would install first on the bus bar terminal.

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373

Last edited by DT; Dec 11th, 16 at 12:04 PM.
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post #6 of 11 (permalink) Old Dec 11th, 16, 12:20 PM
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Re: Aftermarket Standalone harness vs GMPP

Depends. If you are using a f solenoid the the starter cable run a separate fused #10 to the Jegs t block. Then you can run fans AC etc from that block.

If not the f solenoid the batt cable to starter and wire from starter to t block
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post #7 of 11 (permalink) Old Dec 11th, 16, 12:57 PM Thread Starter
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Re: Aftermarket Standalone harness vs GMPP

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Originally Posted by Vega$69 View Post
Depends. If you are using a f solenoid the the starter cable run a separate fused #10 to the Jegs t block. Then you can run fans AC etc from that block.

If not the f solenoid the batt cable to starter and wire from starter to t block
Yes a F solenoid. Thx again.

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #8 of 11 (permalink) Old Dec 11th, 16, 01:37 PM
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Re: Aftermarket Standalone harness vs GMPP

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Yes a F solenoid. Thx again.
Ok then run a wire from the batt side of the solenoid with a fuse or fusible link the the TBlock.

That way your radio etc will have constant power and will retain settings.
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post #9 of 11 (permalink) Old Dec 11th, 16, 02:06 PM
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Re: Aftermarket Standalone harness vs GMPP

Another thing to think about is the GMPP uses an E67 PCM where as some of the others use E38s. Either one will work though. I have the GMPP and haven't had any issues with mine.
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post #10 of 11 (permalink) Old Dec 12th, 16, 11:54 AM Thread Starter
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Re: Aftermarket Standalone harness vs GMPP

Also, PSI does NOT do a "performance tune" so they use stock parameters and remove some things, but that's it. All good info, thanks guys.

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #11 of 11 (permalink) Old Dec 12th, 16, 12:14 PM
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Re: Aftermarket Standalone harness vs GMPP

Base tune on the GM set up too
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