Where to put the PCM???
Hi guys,
Where is everybody putting their PCMs on the 64-66 trucks? I have a 65 GMC 5.3 swap going on and I'd like to hide all the wiring but am also adding Vintage Air so space is limited. Please post up your pics and suggestions, thanks! Joe |
Re: Where to put the PCM???
Put mine under the seat
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Thanks |
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I'd go under the seat if possible with everything..
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Orignally had mine mounted on the inner fender well with fuses etc, but when I rebuilt my truck and ditched the inners, we relocated all the ecm stuff to the passenger upper footwell area. May not be an option since you'll have a/c ducting.
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For those that are locating them under the seat on a 64-66 what harness is long enough, aftermarket? Rewired OEM? I would appreciate any pics you have.
Thanks |
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I don’t have pictures but wiring onder carpet made my own harness
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I've used PSI on all my swaps...their harnesses have 4-5 ft of wire from the back of the head...I contacted several of the "store bought" harness makers and none would make a longer harness.....with the LS swap being so popular ,you would think someone would offer a long harness...if you build your own you can make it however you want....I know PSI is coming out with a DIY kit...
Of all the engines I've bought I have yet to get the factory harness that wasn't damaged in some way.... |
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Call BP Automotive. Their harness is made to put the PCM under the seat. The one for my 71 is more than long enough. The harness is a work of art as well. Labled and easy to install.
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Thanks 71 step...Wish I knew that before....BP is one I didnt contact...
and thanks brew...I'll have to remember that next time about a van harness |
Re: Where to put the PCM???
I've got computer below the radiator and the relays are on the inner fender tucked up against the core support. Makes for a nice and seamless install that doesn't draw a lot of attention to the things that aren't supposed to be there.
https://farm5.staticflickr.com/4164/...3a84c5ea_c.jpg https://farm5.staticflickr.com/4193/...82bed74a_c.jpg https://farm1.staticflickr.com/836/3...de2d4b4f_c.jpg |
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They will also extend it 3' for $100 |
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Here is what mine looks like in a 71.
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I am mounting mine under the seat. I am using a PSI harness. I can attest that I wish the PSI was about a foot longer. It will work, but the extra wire would have been nice.
My mount is from Motobilt https://www.motobilt.com/product/ls_engine_ecm_mount |
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Thanks guys! I ordered my new harness from BP today. I measured the PSI harness and it is only 48" and now on eBay. I will post more when I get the project more complete.
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Bolted it to the rad support on the grille side, tucked away nice out of sight. My harness was a 2008 van harness so was extra long but was easy to tuck all the slack wire in under grille/rad support
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