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I have an 89 Mustang, and fuse 5 works, but only intermittently - started last year and continued today. This would be the turn signals, convertible top, and back up lights. The heater blower (fuse 9) works or doesn't work based on that circuit too. I did check the fuse and swapped it out even though it looked good (just in case).

My original assumption was a loose/or rotted wire near the fuse box... until I realized the heater blower wasn't working too. It may still be near the fuse box, but with both of those circuits not working is there somewhere else that I should be looking? I haven't had a chance to test yet, but once it warms up I will.
 

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test the circuit with a test light and dvom

high resistance, or open or a short to power.....who knows, until you test.
 
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