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International Automotive Technicians Network
Re: Quad Driver A Failure
Posted to Technical Discussion Forum on 10/8/2007 2 Replies

Hi Jim,

When I run into these (usually on GM's) and am unable to see what's on each driver I will unplug the unneeded items. Like EVAP purge or vent solenoids. Then use my scope and an amps clamp to see what the other possible loads are pulling.

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