The pos wire after the switch or relay will be going to ground through every bulb on that circuit. The little resistance in the bulbs is a kind of short to ground that burns the bulbs. So there just may be a bulb on circuit in line before where you are testing. If you have a true short you will have to remove bulbs on that circuit to look for it properly. Are you blowing fuses . Are you getting 12v pos on the circuit.
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