Maybe I'm missing something here, but when I added a PMD cooler to my 94, I just unpluged the harness from the old cooler and connected the harness to the new PMD. I did use a new resister for the new PMD. Leave the old PMD in place on the pump and use it as a spare. No need to remove it.
-1989 Chevy Silverado, 3/4 Ton, Ext. Cab, Long Bed, 4x4, 6.2 Diesel, SM465, 160K Miles, Watson Brown-Lipe over/under auxiliary transmission, Onboard air compresser, Auto-Crane.
-1993 Chevy 3/4 Ton, Reg. Cab, 2wd, 6.2 Diesel, Auto, 58K Miles, Stake Bed, Ex Air Force Truck.
-1993 Chevy 3/4 Ton, Reg. Cab, Long Bed, 2wd, 6.5 Turbo Diesel, NV4500 -- For Parts.
-1994 Chevy Silverado, 1 Ton, Ext. Cab, Long Bed, 4x4, 6.5 Turbo Diesel, 4L80, 228K Miles with low mile 2002 military AMG-GEP engine.
-1994 Chevy Silverado, 3/4 Ton, Ext. Cab, Long Bed, 4x4, 6.5 Turbo Diesel, NV4500, 255K Miles.