Mike -
From what I could tell from the wiring diagrams, the Mark VIII fans are variable speed and controlled by a module. You're only going to have high speed. The newer models have 2 wires - light blue and black. The older ones have 3 wires - light blue, black, and one wire that the color was not specified (it says that wire is unused and ends in the harness). Light blue is power, black is ground, and the other black??? Are the 2 black wires the same gauge? If they're not, then the larger one is the gound wire.
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Greg Weigart
IAIIA 520/pump gas/SD 325 E-heads/266-272 SR cam/1050 Dominator/3.73/ET Street Radial Pro/3300lbs/1.35 60'/ [email protected]/ [email protected]
Hot Rod Drag Week finishing averages:
2014 - 11.12 @ 118.56
2015 - 10.84 @ 124.97
2016 - 10.56 @ 127.88
2017 - 10.29 @ 130.74
2018 - 10.29 @ 130.53
2019 - 10.16 @ 132.34
2021 - 10.09 @ 132.69 - Quickest Pontiac
2022 - 10.13 @ 133.07
2025 - [email protected] - 2nd place SRBBNA
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