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Unread 07-15-2013, 01:30 PM   #1
thug3
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1989 MJ Comanche 
 
Join Date: Jan 2013
Location: Marana, Arizona
Posts: 6
Fusible Link

I have an 89 Comanche 2WD 4.0 5 speed. Just replaced my fusible link for the second time in 2 weeks. upon investigation found positive battery cable to the starter completely melted. Don't know what caused this? When the link blows it kills the engine but everything else still works. Please help. Thanks

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Unread 07-15-2013, 08:51 PM   #2
cruiser54
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1990 MJ Comanche 
 
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Location: Prescott, Arizona
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Have you replaced that melted cable? Is your starter covered in oil?
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If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 07-16-2013, 04:18 AM   #3
thug3
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1989 MJ Comanche 
 
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Location: Marana, Arizona
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No not yet. I want to find out why it melted first so it doesn't melt a new one. And no, the starter isn't covered in oil. Maybe corrosion inside battery cable? Gonna check that Friday.
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Unread 07-16-2013, 05:24 AM   #4
cruiser54
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Got an ohm meter? Multimeter? Check the resistance between the ends of that melted cable.
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 07-16-2013, 05:37 AM   #5
thug3
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1989 MJ Comanche 
 
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Location: Marana, Arizona
Posts: 6
Yes I do. I will check that. Also have a new cable to compare it to.
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Unread 07-19-2013, 09:28 AM   #6
thug3
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1989 MJ Comanche 
 
Join Date: Jan 2013
Location: Marana, Arizona
Posts: 6
Checked the old cable and got same readings as new cable. Someone suggested the starter shorting out, but I haven't had any problems with it . Not dragging or anything. Once it starts the starter is out of the loop right? The only cable I haven't removed is the smaller one from the starter relay to the altenator. But it looks fine from what I can see of it.
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Unread 07-21-2013, 01:19 PM   #7
thug3
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1989 MJ Comanche 
 
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Location: Marana, Arizona
Posts: 6
I replaced the fusible link with 8 gage wire and a 30 amp thermal circuit breaker. Can't find anywhere that says what the amperage is for the fusible link. Worried I might have too high amp circuit breaker.
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Unread 07-21-2013, 01:28 PM   #8
cruiser54
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Quote:
Originally Posted by thug3 View Post
I replaced the fusible link with 8 gage wire and a 30 amp thermal circuit breaker. Can't find anywhere that says what the amperage is for the fusible link. Worried I might have too high amp circuit breaker.
I used to have that info from Jeep but lost it in a computer crash. Working on getting it again.

I had the info gauge vs amp rating. This is all I have now.

Which link blew?
fusible-link-colors.jpg

__________________
Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 07-21-2013, 11:19 PM   #9
gus7
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ok get vom over the voltage and ohns if you have bad grounds, your alt can over charge - charging system needs looking too .....
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