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International Automotive Technicians Network
Re: Test light upgrade
Posted to Technical Tips Forum on 3/4/2019

If you remember doing ecm controlled circuit pinout testing for 20-ohms (min) back in the 1980's then you should understand how driver circuits (quad drivers on GMs) got an over-current.

The same thing seems to be happening these days when ignition coils sho... Login to read more.