From the battery to frame directly under the battery box. From the frame to the engine at the motor mounts with a short ground cable. Usually on the drivers side.
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the metal mount bracket is the ground
it is a tan wire or so the wire diagram says
1-8-4-3-6-5-7-2
The 1990 Chevrolet Corvette IAT sensor does have two wires. The sensor has a ground wire and a positive wire.
my wipers quit working, got a new wiper motor , it did not work either, found out that it has lost ground, attached a ground wire to engine and wiper motor and it worked.
the hot wire goes to the starter and the ground wire bolts to the engine block.
The battery ground wire runs from the battery to the engine block.
There is no ground wire.... it grounds through where it touches the engine
The ground wire leads from the negative side of the battery and connects either to the engine block or to the frame of the automobile.
ground issue on wiper motor housing