post #1 of Old 02-25-2015, 06:25 PM Thread Starter
mattsez
Registered User
1993 YJ Wrangler 
 
Join Date: Nov 2014
Location: adrian
Posts: 157
need help with alt fuse issue plsss

93 wrangler 4.0
My alt went bad....so i went out and got a new one....still wont charge.....noticed the 50 amp alt fuse was blown....so i replaced it. the INSTANT i start the jeep....the fuse blows violently. And yes....i tried using a second alt as well....same issue. This is a dead short type of fuse blowing. Jeep runs fine....but if the charging system is hooked up....pow.
I see alot of threads about this online....is there a common prob or a bug i need to know about?
Im stuck !!!
i didnt go mudding or into water......was driving great yesterday.

mattsez is offline  
post #2 of Old 02-25-2015, 07:58 PM
TSEJEEPERS
Web Wheeler
 
TSEJEEPERS's Avatar
1993 YJ Wrangler 
 
Join Date: Dec 2003
Location: Morton IL
Posts: 5,442
Is this thing hooked up on the back of the alternator?
(Picture is sidewase)
[IMG][/IMG]

93 YJ SOA 2" springs front, XJ springs rear w/main leaf added, High pinon 9 inch rear detroit locker front Dana 44 ARB 4.56 Gears, 36 inch Irok tires too much to list. www.mijc.org
TSEJEEPERS is offline  
post #3 of Old 02-25-2015, 10:07 PM Thread Starter
mattsez
Registered User
1993 YJ Wrangler 
 
Join Date: Nov 2014
Location: adrian
Posts: 157
yes,,,,,2 very small contacts,,,,,and its grounded.....with a sep ground next to it....all tight.....not sure what it is.....but its there
mattsez is offline  
post #4 of Old 02-26-2015, 05:57 AM
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
Posts: 20,786
There are 2 fuses not 1. If one fuse is blown the load will take out the other. Check to make sure both are good. If they are both good then disconnect the alternator connector on the back but leave the battery cable connected and turn the key. If the fuse doesn't blow then the alternator they sold you is bad. It wouldn't be the first time.
Que89YJ is online now  
post #5 of Old 02-26-2015, 08:42 AM Thread Starter
mattsez
Registered User
1993 YJ Wrangler 
 
Join Date: Nov 2014
Location: adrian
Posts: 157
it was the second fuse. Entire load was going across one fuse and frying it. 2 new fuses installed at same time fixed her up.ty for your help guys.
mattsez is offline  
post #6 of Old 02-27-2015, 09:10 AM Thread Starter
mattsez
Registered User
1993 YJ Wrangler 
 
Join Date: Nov 2014
Location: adrian
Posts: 157
just an update....the back of the alt has a very thin tin cover. And it seems when i did my roll over in a field.....something dented in the side of the tin cover and it was arcing onto one of the coil contacts.....that is what blew one fuse.......
I tried replacing the one fuse.....but both were blown.
So to all that have alt fuse issues, and on line i saw alot.....replace BOTH at the same time with the new alt.
It looked like i was getting a good 100 amps threw one 50 amp fuse since the batt was low.....and you can imagine how the 1 fuse fared.
Very thankful for this forum. I have been wrenching on cars my entire life, but each type of car has its own unique features and issues.....and being able to talk to fellow jeep owners is invaluable to say the least.
If they dont find ya handsome....they should at least find ya handy!!!
Thanks again u jeepers you
mattsez is offline  
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome