Where does the voltage drop occur? Does it also drop at the horn relay? How about at the junction block by the battery. If you know where it starts it makes it easier to find the problem. Could be corrosion where the the forward light harness plugs into the bulk head connector, or at the main splice near the horn relay or the horn relay or the junction block.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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