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When you check them, with say a test light and they work. It is because you have a good ground with the test light. Check and rerun ground wires if necessary On the back of the truck, check for ground straps from the frame to the bed..
The Bulbs Have 2 filliments in them if 1 is burnt out that would give you the fast not working tail light there may be an issue with the brake light switch located above the brake pedal on the arm.
those lamps have 2 filaments and one of them (the lower brightness one) is burnt out and the brighter one (brakes and blinker) still works. you need to replace that lamp
The front park lights work correct? If the front park lights work than there is not a problem with the light switch since the brown wire from the switch supplies power to the front park lights, front side markers, and the rear taillights. There should be twelve volts on the brown wire from the headlight switch with the connector plugged in and the park lights turned on. If this is true that there is a problem with the wiring to the back of the vehicle. A thorough inspection of the harness should reveal the problem.
The dim break and blinkers support the above. High resistance also know as corrosion, in the wires or connections would cause this problem.
If you put the tester on the outlets and it lights up properly but the bulbs dont, you have already concluded that the wiring isn't the problem. unless of course the wires are corroded and simply putting the bulb in shorts it out. Have you tested the bulbs?
check all of the bulbs on that side 1 of them my not be working(it may light up but not flash because some of those bulbs are combo bulbs)meaning that some turn signals are used by part of your tail lights or break lights.
the break light wire on the lumina runs through the blinker switch or multifunction switch on the colum.. check there as well as at the tail light sockets. on the late 90s gm cars the sockets had a tendancy to rot away... use a test light at the brake light wire in the trunk and have a friend apply the break. if there is power then may have to get new tail lights. or replacement bulbs.
Do you have dash lights? If you don't then the problem with the tail lights is a bad headlight switch. Tail and dash lights are on the same circuit. If the dash lights are working then you will have to go to the connector under the box on the driver's side just behind the bumper. Chances are there is corrosion there. It could be in the connector but is more likely to be at the back where the wires go in. Use a test light on both sides of the connector to check. You should have 4 wires, brown for tail lites, yellow for driver's blinker, dark green for other blinker and light green for back up. Also check and probably repair the black ground wires. Make sure they are clean bare metal and so too the place where they ground on the body. If this doesn't work, pull the wire harness out of the box and check it carefully for cracks in the insulation where it could ground out or breaks in the wire. Hope this helps.
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