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1st thing
1st thing check wires going to msd box. Large red should be hot all the time with battery. Small red should be hot with key on. Use a good ground with both tests. There's nothing in wire diagram that shows any fuse for the msd box or anywhere these wires come from that power the unit.
tom
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 No I wouldn't race you, my lug nuts require more tourqe than that thing puts out........
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