LS3 Harness ground

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06-19-2020, 04:18 AM

frog7151

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LS3 Harness ground

In the middle of an LS3 swap. Where do ground the three grounding wires on the GMPP harness? No problem with the first one, have it going to the side of the block. What about the two in the near the engine oil pressure sensor?

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06-19-2020, 04:18 PM

Michael Yount

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I grounded both heads and ran a lead to the firewall/unibody.

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06-19-2020, 05:29 PM

frog7151

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Thanks Michael. I was a little nervous about using a head bolt.

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06-19-2020, 05:30 PM

frog7151

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Quote:

Originally Posted by Michael Yount

I grounded both heads and ran a lead to the firewall/unibody.

Thanks Michael. I was a little nervous about using a head bolt.

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06-19-2020, 05:36 PM

TomM

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Don't use a head bolt, there are threaded holes in the back of the heads where the OEM place the grounds. The ring terminal is big enough to fit the bolt through...

T,