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The ignition fuse on a 1985 Honda Magna blows 60 seconds after the ignition switch is turned on whether engine is started or not Until fuse blows engine runs fine What is most probable cause?
Wiki User
∙ 15y ago
Answer 1 Repeated "Blowing" of ANY Fuses Fuses and Circuit Breakers are safety devices designed and installed in electrical circuits TO PROTECT the conductors [wires] from short circuits and overload conditions which can cause extreme overheating which can result in damage to the conductors, and worse, the possibility of a FIRE which could destroy the vehicle. When a fuse, and replacement fuses blow, especially if it happen repeatedly, is an indicator of an UNSAFE CONDITION in that circuit, usually a short. Do not install a larger fuse in a misguided attempt to correct the problem. To install a larger fuse would invite damage to the wiring and an electrical system fire. The proper "fix" is for a qualified technician, who knows what he/she's doing, to troubleshoot the circuit, find and identify the defect, and make proper repair[s], BEFORE replacing the fuse again [with the properly sized fuse]. Answer 2 "Blowing" Ignition Fuses In the case of this specific 1985 Honda Magna VF700C, the problem was an internally shorted-out voltage regulator/rectifier. Luckily, before blowing the final ignition fuse, the voltage regulator put out a puff of smoke. After removing the voltage regulator (located under the seat), two small melted areas of plastic could be seen on the underside of the regulator. For about 6 months prior to blowing the ignition fuses, the battery had been using more water than usual, undoubtedly because of overcharging, due to the malfunctioning regulator. Note that the new aftermarket regulator (OEM no longer available) does not use the black electrical lead on the 6-prong plug. The black lead has been designed out of the circuit, and is no longer needed. While the internally shorted out voltage regulator/rectifier was determined the cause in answer 2, this may not apply in all such cases, and should be a starting point in the troubleshooting process.
Wiki User
∙ 15y ago
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