Question about 1990 Toyota Pickup
The reverse lightbulbs should be 1156. The issue coould be the trans reverse switch, but that is a rare failure. What I would do is be looking for corrosion at the connector that is under the bed, and then branches out to the taillamps. With the key on, and the trans in reverse, you should have 12 volts at the Red with a Black tracer wire in that connector. This is a very common failure area.
Hope this helps.
Posted on Oct 04, 2008
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