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93 mustang

My 93 mustang low beams flash on and off every 5 to 10 seconds after warming up. if it is a fuse, where would it be located?

this is a 4 cyl.

Do both sides do it? Are they turned on, as opposed to them turning themselves on? My guess is a relay not a fuse. In fact if it were a fuse, you would need to replace the fuse each time. It could be a automatic resetting thermal breaker, but my money is on a relay or a connector somewhere along the line, maybe even a problem on the ground side.