Joined: Sat Aug 07, 2021 10:20 am Posts: 5
Vehicle: 1991 Sierra WT SJ413
Posted: Wed Feb 16, 2022 6:37 pm
The idle up circuit works whenever the blower, headlights or rear window demister are activated. This is accomplished via 12v into diode block and into TWSV. Does anyone know where this is actually located on the vehicle?
ahhhh, don't quote me but I believe it's under the dash, drivers side, basically next to the ignition barrel. The diode pack is in a white plastic housing just hanging out of the loom, you will need to unclip the lid.
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