97 dodge dakoata main fuse keeps blowing 140 amp fuse

Hi Kelly, IM AL the owner of Big As Auto Repair.

YES Kelly that fuse will keep the vehicle from starting, If you install a new fuse and it blows again you most likely have a shorted alternator, to check it out, simple unhook the power wire from the back of the alternator, install a new fuse and if it does not blow again then replaced the alternator with a new one. CAUSION: Please be very careful not to let the power wire from the alternator touch anything be cause it can melt something. Best way is to unhook the battery, take the wire off and wrap it with a towel then hook the battery back up and do your test with the fuse. Hope this helps and please visit my auto-repair-website:

Sorry if didn't help brb I a check something that can probs help

fuses blow because of excessive current flow from a dead short to earth. You haven't stated which fuse blows and what the items are covered by that fuse. so check the power wire from that fuse and trace it until you find a burnt area or a place where the power wire is touching the body before it gets to something it is running

Usually that fuse powers the alternator and the fuse box.
It would have to be a big short to ground to blow that fuse.
Its possible the main wire to the alternator is touching a metal spot, or the alternator is shorting out inside when it is running.
What is draining the battery may be something else, or the battery could be discharging after the fuse blows if the alternator is not charging it.

This 30 amp fuse, If it blows when cranking, it is usually the starter dragging, if it blows by just turning the key on it is usually the fuel pump drawing too many amps.
I hope this helps.

weneed to find the open line of your electrical wiring

my mazda 626 familia 97 the main engine fuse 80A was blown and my car totally dead..is it have a big electrical problem cause the fuse to blow up?

this problem is most likely caused by a fuel pump with high amp. draw on start up.use a amp meter.then replace fuel pump.

you got a grounded wire. check the wiring in the back of the radio if its custom radio i can almost gaurentee thats what it is. however electrical aint my best area. lemme know if i helpd any.

Does it only do this when the heat or A/c is on full blast.. ( I had a few of my customers with this problem and they needed a new blower motor..)