Did this vehicle have some body or interior work done to it? It sounds like the ground lead was not reattached on that side during reassembly. Look inside the engine compartment around the fender and head light area for a separate ground lead. Follow the wiring harness as much as you can from there to the back of the vehicle including underneath the vehicle and inside underneath the carpeting. Finally checking the trunk area by the tail lights. If you can't find a separate lead, then attempt to find a ground lead in the harness itself. Connect a test light to the positive terminal (red) of the battery. Probe the test light into one of the light sockets until you find one that causes the test light to light up. You can then splice a wire into this ground lead to function as a test ground connection. Connect the wire to something metal on the vehicle. If the problem goes away then a grounding problem is indicated. This lead connection can be used as a temporary ground until the other connection is found if it is done correctly (good quality splice, right size wire, good solid connections). I hope this information is helpful and thank you for using Fixya.com.
CAUTION : Be careful when working on the electrical system. Always wear safety glasses when working around a battery.
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