Car wont start, 40 amp ignition fuse blows when i turn yhe key on
U have a positive wire making ground
SOURCE: 98 PLYMOUTH GRAND VOYAGER WONT START - BLOWS ENG FUSE - HELP
You have a shorted engine harness, this is not common but it does happen, heat and engine movement cause damage to the harness, this is most common on hi miler cars and vans, the only way to fix it is to start by looking anywhere the harness rubs, that is where the damage occurs.
SOURCE: ignition switch fuse terminal is blowing red 40 amp fuse when i try to replace it
A fuse that is consistently blowing is telling you that there is a short in that system. Don't attempt to bridge it or use a larger amp fuse or you will have a major problem. You will need to start tracing wiring to destinations to find the short. If while moving harnesses around problem ceases to exist, look at nearby items where you are working and try to locate what was grounding. Sometimes people will stop if short disappears, leaving open the possibility of it happening again.
If you are not comfortable working with wiring, then leave it to professionals who do this every day. It's not really difficult but requires patience and a good bit of knowledge to do this right!
SOURCE: What could cause a 40 amp ignition fuse to keep
There may be several issues causing you problem. One is that you have a bad connection either on the battery or on the starter or even a bad battery cable. I would suggest removing the battery cables, If it's side post a 5/16 wrench or socket. If it's a top post then it's likely to be 7/16 or 10mm. Using a terminal brush
clean both the negative and positive terminals. But before reconnecting them, inspect the cables from the battery to their respective connection points. (The starter and the block) Make sure they do not have any broken insulation or dark discolorations in the insulation which represents excessive heat and a weak spot in the cable. Also check and clean the connecting points. Using a socket to remove the ground cable, once removed use a stiff wire brush to clean the surface of the block, then reconnect to the block. Then move to the starter, Using a 5/16 remove the solenoid wires and a 1/2 or 9/16 to remove the battery cable from the starter. Again use a wire brush to clean both surfaces and check the cable ends (eyelets) for a good connection. then reinstall the cables.
I am not sure how they tested your starter, however I have seen several auto parts stores use a diagnostic load machine that checks the starting system without the removal of the starter. If this was the test performed this is not an accurate test for a starter. The Starter will need to be removed, taking the positive cable loose from the battery, then remove the battery cable from the starter with a 1/2 or 9/16 generally socket and a 5/16 generally for the solenoid wire. Once the wires are removed you will have two 9/16(generally) bolts that can be removed with a socket and ratchet. Once the bolts are removed the starter will already be wanting to come out. Remove the starter and take it in to a reputable Auto parts store and ask them to perform a load test. This load test will give you the exact amp draw of the starter and solenoid and then they can tell you if it exceeds the manufactures spec.
Thanks, Dorrian
SOURCE: blowing ignition a fuse
I believe you mean a 40 amp fuse? Wow! that's a dead short somewhere on a large wire. Could be difficult, or hopefully easy to find. There's always the smoke test option: Solder a jumper wire across the top of the fuse, making the circuit essentially un-fused and look for the smoke. Not the best method, but quick. Warning: if you do this, depending on where the short is, you could melt down the wire harness or possibly start a fire. Try this at your own risk! IT'S A "LAST RESORT" THING, WHEN YOU'VE TRIED EVERYTHING ELSE AND FAILED! Good luck.
SOURCE: blowing a 40 amp ignition
It is a grounding problem.Your motor does not have a good ground from the motor to the frame..Bad starter will not blow a fuse. Clean all of the grounding straps especially the big ground wire from the battery to the motor. Bet if you check that little ground from the battery to the frame it will be melted..because the main ground to the engine is bad..
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