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The entire vehicle is the ground, if you look at the wire from the negative terminal of the battery you will see that it connects to the engine metal, and in most cases another goes to the frame or body. That means that any circuit that has a power wire and is touching metal is grounded and will complete a circuit if power is applied. In the event that the circuit is attached to plastic then a short wire from there to the nearest metal can be found.

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18y ago

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