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I've seen two of his installations, they were both parked beside me at the Pueblo, CO rally in September. There was another 6.5 there by Bill Hubler that he completed in 2003. Four of us in the same row, crazy. Manny and I had a friendly competition doing the swaps. Mine is a whole lot more...

I did a build album here if interested. .http://www.gmcmhphotos.com/photos/u42137-hal-stclair.html Hal

Well, I finally found the problem. When I wired the DRAC I used a pair of connectors I sourced from a wrecking yard. There were 3 'extra' wires not needed for my application so I just taped them together and left them in the new harness. It looks like two of them were in contact, probably the...

The H1 has a stand alone ABS ECU with no ties to the PCM that I can see. I built the harness using the H1 manual and have no trouble codes or other running issues. Of course the 1977 GMC MH had no ABS. On part of my harness for the VSS's I didn't use twisted pair cable but with the trans...

Well, I've been fighting this for way too long and still haven't resolved the problem. I swapped out the PMD, removed the extension wire, tried a different DRAC, had another PCM flashed and still nothing. I even mounted in a set of switches temporarily for the cruise stalk without success. The...

I wired the brake light switches per the wiring diagram and as you suggested and trouble shot it through the H1 manual with no luck. Everything checked out per their chart. I need to check the voltage on the brake light cruise switch and make sure there isn't some stray voltage there. I hadn't...

I just did a 6.5 swap into a 1977 FWD GMC motor home in a unique way. The GMC motor homes used a Toronado fwd trans axle arrangement so the swap was a little different. The 6.5 and 4l80e came from a 2000 H1 Hummer and I kept all the electronic engine controls. It runs great but I can't seem to...