Quote:
sounds like the rear lights have a ground issue.
do you have a volt meter?or a test light? install that on the coil + terminal and see what happens when you turn the key off, engine stopped. then try it again with engine running.if it has power with engine running but key off, disconnect the power wire on the alternator and try it again. if that fixes it then you may have an alternator problem.
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^^^ Very good set of test steps.
Additional questions:
Does your truck use a factory fuse panel with old glass fuses? You may have inadvertently moved a fuse or you may have the wrong length fuse which is bridging another circuit.
Did you connect any wires from light switch to another circuit under the dash looking for a power supply? Those wires by be unexpectedly powering the ignition. Can you tell if the intensity of the lights changes when the key is switched from on to off?
Did you accidently bump wiring at the ignition switch? You may have caused adjacent terminals to make contact when they should be separate. Locate problem visually and move wires.