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Why does it keep blowing the alt fuse?

Has new alt and battery

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Fuses blow because of excess current flow ( dead short)
check that the wire to the alternator is on the correct terminal

Posted on Apr 27, 2015

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Posted on Jan 02, 2017

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I just put a new alternator on my 97 isuzu rodeo but it still draining the battery and stalling how do I reset the computer so it picks up the new alternator of is it something else


i bet you skipped step 1, in the book, FSM and all car repair books in print, 100 years now.
disconnect the battery neg lug first.!
oops, you blew the main fuses. (or blew up the new alt... sad huh)
cb 7 or cb3 fuses blown? CB means cab fuse.(dash box)
drains driving, i bet.
right.?
and the battery is not 13.3v to 15vdc running (good range)
bet 2:
and engine RPM is 800RPM or more at all times, right?
not 400.
the belt is not slipping or missing.
the connections are all tight
the battery cable lugs, are all clean, x4 ends. right?

no engine stated, size and number of cylinders.
as you may not know, diffr, engines sometimes have diffr ALT.
usa answer (for just 2 engines only , usa)
2.6L and 3.2 liter both have PCM generator gain control pin
and the PCM can be bad.
is the charge light glowing running, ?????

here is the proof the PCM does run the reg inside ALT.
called gen gain line.

25782645-zy5i2xuw3mfjw4tca3plar50-1-0.jpg you didnt blow EB17 main fuse that kills all .
there is the CB fuse , for alt.


25782645-zy5i2xuw3mfjw4tca3plar50-1-1.jpg

Jul 13, 2015 | Isuzu Cars & Trucks

2 Answers

How do i fix my voltage regulator 98 dodge ram 5.2 new battery new pcm?


Voltage regulator is internal to the Alternator. You have to replace the Alternator.

Aug 13, 2014 | 1998 Dodge Ram 1500 4WD

1 Answer

Alternator not charging


is it charging at 14.9 ? 14. any thing is at 1000rpms ( no lights or radio etc working) 13.23 to 13.86 volt is good enough to charge battery. what is the charge rate.

Jan 30, 2014 | Acura CL Cars & Trucks

1 Answer

Battery light alternator


The Charge lamp comes on with the Alternator fails to keep battery charge going. (lots of way to fail, and ALT Is 100% good) it's a system. each part of it must be good, end to end.
so...
i put my voltmeter across battery, i start car, i see 13.3 to 15vdc, alt is good.
no? , i see now, 12.2v. ALt is dead, (i didnt say bad) and battery is sightly discharged, 12.6v is charged. (key off, rested voltage)
This 12v tells me the ALT is shut down. only why is the question.

how can any charge system fail,
bad battery tops the list here, they LOVE to fail.
1: belt slips.
2: belt missing
3: bad alt.
4: bad wires to ALT . (corrosion on any wire or lug)
5: fuses blown , any listed below.:
your alt is not an ECU controlled, alt ,its 100% self contained

did you ever remove the ALT and blow the 100 amp fuseable link
the first step of any alt pul, is the pull the NEG, battery lug or BOOM.

im logged in to alldata.com so can you.

and what do i see.
a 5 wire ALT. one is the frame ground, so it must not be rusty or..... it fails. frame to engine block. no rust here.

wire L , yellow.goes to dash LEDs (alt failure idiot lamps) (this works)
wire. S white goes to ALT 5a fuse, is it blown?
wire :B B/G color, goes to the 100 amp link fuse. (blown>?)
wire IG Red-white, goes to a fuse marked 10A gauge.

i think the IG wire is the voltage sense wire.
no sense, no charge. I think the whole I/P dash cluster goes dead when this fuse blows.

The S wire is the boot strap voltage sense, it wakes up the regulator .
if open , the reg stays asleep, as does ALT.
Alternators can not self start, the regulator has boot strap device
that cures that. called self excitation. so this wire is critical.
All wires except the L wire is critical. in this case.

the B wire is the big wire, it charges the battery . 50amps or more..

any of the 5 paths open , kills the ALT dead.
The REG inside the ALT can also shut it down.
eg: battery bad, with huge cell resistances. total.
eg: overvoltge for any reasons. including attempts top run car with no battery, (dont ask)
eg: over current (battery cells 1 to 6 shorted) or 25 KC lamps added.
eg: over temperature shut down.

that is about it.







Dec 31, 2013 | 2003 Toyota Matrix

1 Answer

Replaced the alternator and battery on 98 civic ex, car ran cherry and all of a suddent doesnt want to start, just died on me while driving.


ran cheery, the exhaust ran red hot? LOL.
the engine runs off the alternator not the battery.
so , if the alt is bad,the battery will discharge.
the alt charge lamp glows, did it?

old post,
bad alt, or battery is no good.
try a known good battery , and make sure the
voltage across the battery is 13.3v to 15vdc running.
if not the ALT System is bad, notice I said system.

btw , replaced means nothing to me.
new , used, rebuilt, recycled, , what?

Sep 20, 2013 | 1998 Honda Civic

1 Answer

ALTERNATOR wont charge


What is the idle speed? Are you sure the belt is routed correctly?

Apr 26, 2013 | 1993 Mazda MX-3

3 Answers

No charging condition - tested new alt, tested new batt


OK....Since you've tested ALT & BATTERY?..Then you should inspect that missing fuse for horn and see if maybe it's been put in as a replacement in a port for anything to do with charging system,ie: alt,battery or other?....Then check ANY fuse links on the wiring/battery cables and other like to altenator etc....If you dont know what a fuse link is,most times it's on the hot wire that goes to starters,close to it,and to explain what it is--it's a short length of wire that is smaller,like a filament,like a bus fuse,cept these are coated and you cant se theyre blown,you have to do a continuity test to see if filament type wire isnt broken.....Another thing you may want to try is ADD an additional body ground wire from battery negative post to body of vehicle.I had a 71 Monte Cralo way back and I went through a similar thing and NO electronics thank god! But I added a fresh,thick wire from battery to body heavy bolt type screw and problem was solved....Hope I ahave helped,please post if it did...Thanks JD

May 02, 2017 | Cars & Trucks

1 Answer

2006 hyundai santa fe keeps blowing alt fuse


Have you had the alternator tested off the car ?

Jul 09, 2012 | Hyundai Santa Fe Cars & Trucks

1 Answer

On 3rd alternator ,cant get them to charge the battery and in turn they keep burning out


First have battery checked at shop that knows what they are doing.

Aug 07, 2017 | 1995 Dodge Neon

1 Answer

Alt new battery new no charging can i energize the alt i believe the ecu is faulty


dont trust new, rebuit
have it checked
energizeing is a thing on older alt
new alt have relay to switch from running ele to charge
when senceing battery low

Feb 28, 2012 | 1991 Dodge Dakota

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