Dark Shikari
19.06.2021 10:34:09
Compare these reading to battery voltage as well as battery voltage measured at the ignition switch before and during cranking.
See full version: Weak battery causing blown fuse
Compare these reading to battery voltage as well as battery voltage measured at the ignition switch before and during cranking.
A slightly poor connection causes voltage to drop but also causes amperage to raise and will blow the fuse. A low battery can mimic this, charge the battery and take it in to NAPA or somewhere to be Load tested to be sure it is not contributing to your problem. here
Test the starter trigger wire with a volt meter at the ignition switch while cranking, then test again at the starter relay during cranking. [links]
Re: Weak battery causing blown fuse?? more
The starter motor itself bypasses the fuse, however, the starter RELAY TRIGGER, energized thru the ignition switch in the start/crank position is drawn thru the main fuse. here
2004 115 HP four stroke EFI Mercury outboard that is sporadically blowing its 20 amp fuse (main & tilt/trim) when I engage the starter motor. Could this be caused by an undercharged battery or one with not enough cranking amps? more
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2004 115 HP four stroke EFI Mercury outboard that is sporadically blowing its 20 amp fuse (main & tilt/trim) when I engage the starter motor. Could this be caused by an undercharged battery or one with not enough cranking amps?
Test the starter trigger wire with a volt meter at the ignition switch while cranking, then test again at the starter relay during cranking. [links]
The starter motor itself bypasses the fuse, however, the starter RELAY TRIGGER, energized thru the ignition switch in the start/crank position is drawn thru the main fuse. more
A fuse blows because of a short to ground, before the load, in the circuit[s] that it is protecting. This happens because of Ohm's law, which are the laws that govern electricity. One of Ohm's laws states that if one of the three properties of electricity is constant[Voltage-Battery Voltage is always constant in an automotive electrical circuit] and one of the remaining two properties go down [Resistance=Resistance goes to zero when the electrical path takes a short circuit back to the negative battery terminal before the load] then the last property [Amperage/Current-Amps go to battery amperage] must go up proportionally. The amperage becomes more than the amperage rating of the fuse and "pop" the fuse blows, creating an open in the circuit, protecting it, just like it was designed to do. What was the exact fuse in your vehicle that blew? We can send you wiring diagrams and a guide on how to find the short the ground when we get the exact fuse that blew.
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