I have a 97 galant that keeps blowing the 100 amp fuse? alternator tested good twice checked wiring reads good is there another 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

Sounds like a minor short somewhere.... firstly check around near the Alternator for any possible wires in the wrong place..... but I doubt if you will see anything wrong.... This COULD be an Auto Elec job.... but check first just in case it is a loose wire or something

Check the lines of the alternator sometimes it gets corrosives
Check the tension on the drive belt, bearings, brushes...
Take the current alternator and test it with the new one and check the voltage in the store where you purchased.
check for shorts.
check that gets enough ground.
Also, just because its new does not mean its good special if it's refurbished that I don't know where you purchase it.

I remember a time that I replaced my refurbish steering power pump 6 times. pump was defected took me 6 times. it could be the Alternator regulator to be faulty.

how you can tell if your alternator is faulty. the lights on inside your car will blink go off, when you change station on your radio go off and on, dim, fuses blowing, head lights bulb blowing... check it out.
Test the alternator both the one you have now and a new one,
get second opinion to another place.

If is refurbished and keeps dying try to get the genuine for your car.

Good luck

Why was the battery replaced? Theres no reason the the 100 amp fuse to blow unless the alternator is shorted or you hooked up the battery backwards. I think the 100 amp fuse goes to the alternator. If it was hooked up backwards then you may have engine computer damage.

Check your alternator fuse. On Galant's it is part of the positive battery clamp , is a dealer only part, and can run anywhere from $12 to $20. Your battery light will not come on , your alternator is fine, your battery is in good order, but the battery will go dead and kill the car for no apparent reason. If the fuse is not part of the positive battery clamp you will find it in the fuse box under the hood in this case it is a square fuse (60,70,80 amp etc.).

Sounds like a wire grounding from worn insulation or a faulty voltage regulator being the problem. Normally that is built into the alternator but Mercury used a separate or split unit design for a few years int eh 90's. Unfortunately I don't remember what years specifically.

you may connecting it wrongly , please check +ve and-ve both pole are to be fix with proper wire, if will do wrong it will blow fuse.

My friend;
Try this;

1. Did you insert same valued fuse i.e. { fuse rated 15APS with same fuse}.
2. Check OP'S & voltage of the Alternator = 13.7 V DC - 14.8 V DC MAX.
3. are you sure NO internal shorttings inside the ECM.

How to Test a Car's Alternator
http://www.youtube.com/watch?v=uI0SBtmSjHg&feature =related

Diagnosing an Alternator Problem:
http://www.youtube.com/watch?v=w5TkStVWNvA
how car alternators work


How to Install the Voltage Regulator on an Alternator
How to Rebuild an Alternator



How to Test a Car Voltage Regulator



Try it, & let me know if I add any benefits to you.
I hope I add some thing valuable to you.
Regards;

MAR;
[email protected]

Regulator in alternator obviously faulty, have it bench tested & fixed or replace alternator, and cure your problem.