| scotty305 |
11-04-17 12:47 AM |
A working fuse should have a resistance of less than 1 ohm... the exact value may be different for different fuses, and when measuring such a low resistance the wires of your multimeter also start to influence the measurement. If you measure more than 1 or 2 ohms resistance across the fuse I would swap it for a new one. If you have blown multiple fuses, that indicates there is a problem somewhere on the car, unless you're using a fuse that is the wrong rating for that circuit.
Don't switch to a higher-amps fuse, that could result in burnt wires and electrical fire. It's not uncommon to have intermittent wiring problems in older cars, especially if they have been modified or if the wiring harness has been moved around during other maintenance work. Try to find a pattern in when the fuses have blown in the past... was it at high RPM? Was it while driving on a bumpy road? Was it when certain devices turned on? Find the wiring diagram in the factory service manual, and track down which things get powered by that engine fuse. Look extra closely at those parts of the harness, maybe unwrap the loom and check for broken or chafed wires before you re-wrap it. Electrical problems can be tricky to find, good luck.
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