The cheaper multi-meters can read amperage, alligator clip it in.
Break the connector under the dash, measure amps. Check the positive feeds for resistance, you may be chaffed into the frame rail some where. Fab up a quick harness from under the dash to the taillamps bypassing the original wiring, then directly to the taillamp harness. If problem goes away, it is in that section of harness.
Or with this jumper harness hook your bulbs right to it, measure amps, then go back to your original wiring and masure amps. Huge difference should equal a ground condition somewhere in that section.
I am not a wiring pro or an electrican, but so far most of my electrical issues I have figured out, with my multi-meter. So far, knock on wood...
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