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wmmalett
Dodge Dakota
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7/07/2007
18:10:03

Subject: Alternator Fuseable Link Blowing...Help!
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I have a 2000 Dodge Dakota 3.9 V-6. I was driving home from work the other day and the "Check Gages" light came on. I look to see what's going on and the voltmeter is down to 8 volts(the same spot where it is when the truck is off. So I take it to Advance Auto Parts so they can check the alternator,on the truck. Their diagnosis, the alternator is not outputting what
it should. So I have them get me one $150.00 later and I put it on. Problem solved. Nope. I was taking the core back to the auto parts and same thing happened. This time they check the battery and the machine said that the battery was good but it had a low charge. They couldn't test my old alternator but Murrays could and come to find out my old alternator is just fine. I got to nosing around under the hood and I noticed the
cover for the other set of fuses on the truck.
Great!!! There's a 50 amp fuseable link for the
alternator and it's blown. Problem solved. Nope. Went to go to work this morning and got about 2 miles down the road and same thing as before, check engine light and 8 volts on the gage and the fuseable link is blown. Called the dealer today thinking there might be a voltage regulator that could be replaced and there isn't. According to the dealer the only problem could be the alternator, fuseable link, or the PCM (at a cost of $600). Has anyone out there ran into this problem on a Dodge??? I picked up another PCM and put it on and replaced the 50 amp fuseable link for the alternator and the same problem arises. It gets up to the normal 14 volts on the gage at idle, then when I bump the rpms up to about 2000 and hold it there the volt gage begins to drop. Shut the engine off and look at the fuseable link and it's blown, again. Anybody
have any idea why this fuseable link keeps blowing?? The alternator is fine, the battery is fine, and by installing another PCM I'm pretty sure that's not the problem. HELP!!!!

Thanks,

Bill




Epyon
Dodge Dakota
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7/07/2007
23:34:22

RE: Alternator Fuseable Link Blowing...Help!
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There could be a short in the system. And everytime u rev the engine up the bare wire comes in contact with metal causes it to blow the link



partsmanager
Dodge Dakota
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7/07/2007
23:37:57

RE: Alternator Fuseable Link Blowing...Help!
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Bill take the fuse cover off and look for the main ALT fuse its bolted across the POS and Neg cable that come in to the Power Dist Center (PDC) shold be either a 120 or 140 amp link can blow anytime the Alt/Starter/Batt is changed or cables disconnected many people forget about that main fuse its main job is to save the Alt from overcharging or shorting the battery. Did you check the Alt output directly from the battery post on the Alt with a voltmeter? since you said you had 8 volts on the gauge when running I'd check that main link first then the Alt with a meter. I keep 3 of those links in my glovebox all the time next to impossible to find them on the street and most dealers dont stock them. I've sold plenty because I keep them in stock. common to blow in the winter when jumpstarting somebody and you have all the accys on and the alt is at full field at idle. Good luck and let us know what you find



wmmalett
Dodge Dakota
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7/07/2007
23:53:41

RE: Alternator Fuseable Link Blowing...Help!
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Partsmanager. That's the link that keeps blowing on me. I took the alternator off and had it tested and it's fine. As for a short in the system. Do you mean all the wires on the truck or just the wires on the charging system. I was kind of hoping that someone has had this type of problem before and could point me in the right direction. It's just weird, the truck runs great. I was just going down the expressway and the check gages light goes on. Now that I think about it I'm sure that it was that fuseable link blowing that caused the volt gage to drop and the check gages light to go on.

Thanks,

Bill



wmmalett
Dodge Dakota
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7/07/2007
23:59:55

RE: Alternator Fuseable Link Blowing...Help!
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I also forgot. My truck has a 50 amp fuseable link on it. The red one. I didn't have any problems finding one. Just check any local auto parts.

Thanks,

Bill



partsmanager
Dodge Dakota
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7/08/2007
10:02:32

RE: Alternator Fuseable Link Blowing...Help!
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thats not the one I was talking about its the one thats bolted to the pos and neg cables that come into the fuse box at the top if you're leaning over the drivers fender looking at the box and its def not 50 amps its a dark red 140 amp link.I have a pic avail if that would help you find it.



wmmalett
Dodge Dakota
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7/08/2007
13:43:00

RE: Alternator Fuseable Link Blowing...Help!
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I see which one you are talking about now. It shows on the cover that this is a 140 amp link. I could of swore that it was a 50 amp link. This would explain why it keeps blowing when I maintain 2000 rpms with the engine. You wouldn't happen to have a part number on that link? Being that it's next to impossible to find them on the street.

Thanks,

Bill



partsmanager
Dodge Dakota
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7/08/2007
14:25:31

RE: Alternator Fuseable Link Blowing...Help!
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Its part number 6101757. is yours blown? which 50amp link did you change before? remember the diagram on the cover is REVERSE of how the fusebox is laid out read it carefully. personally id like to meet the engineer who came up with that one in a dark alley sometime and superglue the cover to his head. let us know how you make out



wmmalett
Dodge Dakota
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7/08/2007
16:29:01

RE: Alternator Fuseable Link Blowing...Help!
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The link that I changed before was the one that bridges across the pos and neg battery cables. But I could of swore that it was a 50 amp fuse. I even took it to the auto parts with me to match it to replace it and they were both red which denotes a 50 amp fuse. I'll try locating a 140 amp fuse and maybe this will cure my problem.

Thanks,

Bill



partsmanager
Dodge Dakota
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7/08/2007
16:52:16

RE: Alternator Fuseable Link Blowing...Help!
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maybe the one they gave you was for a different make car we only had 2 sizes in the spot 120amp yellow and 140 amp burgundy (dark red) the one you have should have markings on the plastic cover with the size on it daks/durangos 99-00 should always have an 140amp fuse being the max size alt avail was the 136amp heavy duty one the other was 117amp



wmmalett
Dodge Dakota
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7/08/2007
16:56:41

RE: Alternator Fuseable Link Blowing...Help!
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I may have got my colors mixed up. This was more like a reddish orange fuse not a burgundy. I got this fuse at a local auto parts. But the fuse I took out of the truck was a reddish orange also. Not a burgundy. But it was definatly the alternator fuse though. It was the one bolted to the two battery leads.



partsmanager
Dodge Dakota
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7/08/2007
23:10:54

RE: Alternator Fuseable Link Blowing...Help!
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see if you can find the amp rating on the one you have in there now if its 50amp then were sure thats your prob and replacing it shoud fix it. if you go to the parts store make sure they get you one marked 140amps and not something they hav laying around or hit the dealer close to you and see if they have one (they should)



ummm
Dodge Dakota
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7/09/2007
01:29:04

RE: Alternator Fuseable Link Blowing...Help!
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Have you ever replaced the battery? 7yrs on a battery is a long time. May be time to replace, I dont care what they told you. Arent they the folks that said the Alt was good?



wmmalett
Dodge Dakota
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7/09/2007
16:23:21

RE: Alternator Fuseable Link Blowing...Help!
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I'm going to try the 140 amp fuse. Funny you should mention the battery because I was thinking maybe that could be the problem. If the battery wasn't taking a full charge where would the extra current go?? Would it cause the fuse to blow?? I'm going to look into a new battery also.

Thanks,

Bill



Ron
Dodge Dakota
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12/27/2016
15:40:54

RE: Alternator Fuseable Link Blowing...Help!
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Hello Everyone:

This thread is the closest I've to come to running down a problem with my Father-in-Law's 2000 Dakota.

After reading other threads, this is what I have so far.

The truck has been in the shop numerous times for a dead battery. The present battery is new as of 01/16. The alternator checks out OK.

One odd thing happening was the wipers and radio would continue to work after the key was pulled. Someone suggested the ignition key was worn out, allowing that circuit to remain hot, maybe making contact with the accessory position. The new key fixed that.

So now the battery dies after a couple of days not running.

What I've checked so far is:
-plugged in the meter to read the amps and pulled fuses. Sitting there, the truck is pulling .94A. The fuse that kills all of that is a normal auto 20A fuse labeled "TRAN" in the fuse box under the hood aft of the battery. I assume that's transmission.

-checked the battery temp sensor(read that somewhere) under the battery and its resistance is 22.9K ohms. No idea what's normal there.

-never found the ALT 140A fuse. If someone would point me in the right place, I'd appreciate it.

-wanted to check the alternator diodes for a bad ground, but don't know how to do it.

Thanks in advance and happy holidays,
Ron



dave kramer
Dodge Dakota
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8/11/2019
14:48:41

RE: Alternator Fuseable Link Blowing...Help!
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i have 1998 dodge with same problem 140 fuse blown.old alt test ok. but at battery post to fuse box at idle puts out 27 volts, rpm up will go to 50 volts, more rpm to 105 volts, new alt does the same.



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