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If that is the only instance to blow the fuse; when the contact key is turned 'ON' the relay sets priority to 'start engine' mode, like directing the power to the starting accessories, now when instead you activate something else, the circuit is overloaded: Puff
Hi Aaron, I'm glad to help!
Aaron, see if the fuse blows when you turn the key to the on position without trying to start it. If it does then it could be anything on that circuit. NOTE: If in fact it only blows when you try to start the engine then your problem is in the "START-RUN-CIRCUIT" which mean you have a dead short in either the wiring or something on that circuit. If you find it is on the start run circuit then disconnect the starter and see if it still blows the fuse. CAUTION: When disconnecting the starter always unhook the negative battery cable first then rap the power wire with a rag or tape so it doesn't ground out on the engine and cause more problems. Now that you've disconnected and rapped the starter wires reconnect the negative battery cable and try to start the engine, if the fuse doesn't blow then replace the starter. If the fuse does blow then reconnect the starter remembering my caution. NEXT: Disconnect the Alternator using caution and try to start the engine if it blows the fuse replace the alternator, if it doesn't blow the fuse then you have a direct short in the wiring somewhere in that circuit. Start looking for frayed wiring that could be grounding out on the engine. Hope this help and have an awesome day Aaron.
Hi, Who installed the engine? If you did, check all the Grounds/Earths under the hood/bonnet. If the mechanic/shop did, take it back and have them fix it.
I am a mechanic,i had that same problem where my engine 20amp fuse were blowing....i fixed it...problem were a broken wire in the harnace on the side of the cylinder head....i made over $200 on that job...yahhh
if the fuse is blowing when you turn key to start position then this is where to look for the fault ,between the ignition switch and the relay then the other side of the relay to the starter motor solonoid
sounds like you have a short in the electrical system between the ignition and the fuse box. it might be metal to metal somewhere inbetween in the wiring that is makeing the fuse blow out everytime
I also have a 96 LHS that randomly blows the 20 amp ECM fuse. If this is what you are referring to, the problem may be in one of your ECM sensors. 1-Start by unplugging all ECM sensors (Temp, Cam, Crank, 2-O2, TPS, etc.) and replace the fuse. 2-Crank the starter (the car will not start) and see if the fuse blows. If it does you probably have an electrical problem with the ECM. 2-If the fuse does not blow, plug in only the cam sensor and start the car; it will idle rough and the check engine light will come on. If the fuse blows, the problem is the cam sensor or wiring to it. 3-Continue plugging in sensors one at a time and try starting. When the fuse blows, you will know which sensor and/or wiring to the sensor to check. This process of elimination has worked twice for me.
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