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Burnt fusible link - help #2551518
09/18/18 02:44 PM
09/18/18 02:44 PM
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MAIne
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MoparABE Offline OP
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I was driving my 71 challenger and all of a sudden it died. The fusible link burnt up. Everything is new in the car. Any thoughts on where I should start?

Re: Burnt fusible link - help [Re: MoparABE] #2551535
09/18/18 03:04 PM
09/18/18 03:04 PM
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Calgary, Alberta Canada
a12rag Offline
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check your bulk head connection point to ensure it is tight. I had a rebuilt alternator, that the battery terminal insulator chaffed and shorted to the case - caused the fusible link to go . . . you have a short circuit in your system somewhere . . .

Re: Burnt fusible link - help [Re: MoparABE] #2551770
09/19/18 01:05 AM
09/19/18 01:05 AM
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Greenwood Lake, NY
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fuelishnsilly Offline
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I agree. Check the positive stud on the back of the alternator as I've had them loosen up on my car over the years. Also, the ammeter could be a potential problem too if the thing grounded out.


inherited a 69 roadrunner from my grand pop.
Re: Burnt fusible link - help [Re: MoparABE] #2551857
09/19/18 10:41 AM
09/19/18 10:41 AM
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MAIne
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MoparABE Offline OP
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Those all check out, any other thoughts?

Re: Burnt fusible link - help [Re: MoparABE] #2551883
09/19/18 11:51 AM
09/19/18 11:51 AM
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Canuckville
68Cbarge Offline
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I had experienced in the past the fields in the alternator reverse polarity.
When that happened it did snap the fusible link.

Run some wire from the battery stud back of the alternator to the battery stud at starter relay WITH A FUSIBLE LINK!
If the link snaps right away,the alternator is no good.
If everything lights up and runs fine,the ammeter gauge is no good.
You can leave this jumper wire in permanently since it takes a load off the ammeter gauge and completes the curcuit between the + and - side of the charging system.
Hope this helps.


'68 Newport Custom Barge on a Budget!! BOAB
1973 Satellite WAGON! 318- 3 on the tree!!
2008 Chrysler 300c HEMI!
Re: Burnt fusible link - help [Re: MoparABE] #2551936
09/19/18 02:14 PM
09/19/18 02:14 PM
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Chicago
PurpleBeeper Offline
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69Cbrge has some good advice. You have a dead-short somewhere. You could temporarily install an inline fuse in that circuit & carry a stack of fuses until you figure it out.

Anyway, check the charging system first as noted above + bulkhead disconnect. If those check out, start going circuit by circuit & disconnect them.....when your "fusible link fuses" stop blowing, then you know what circuit you have a short. Check your wiring diagram & see what's on that circuit. PIA, but basically just tracking down a short


70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"
Re: Burnt fusible link - help [Re: PurpleBeeper] #2551954
09/19/18 03:03 PM
09/19/18 03:03 PM
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Rio Linda, CA
John_Kunkel Offline
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Originally Posted By PurpleBeeper
You have a dead-short somewhere. You could temporarily install an inline fuse in that circuit & carry a stack of fuses until you figure it out.


A breaker would be better.


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Re: Burnt fusible link - help [Re: John_Kunkel] #2552007
09/19/18 05:59 PM
09/19/18 05:59 PM
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Chicago
PurpleBeeper Offline
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true


70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"
Re: Burnt fusible link - help [Re: MoparABE] #2552848
09/21/18 01:51 PM
09/21/18 01:51 PM
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MAIne
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MoparABE Offline OP
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Thanks for the help, I traced it to a bad alternator, it was shorted internally causing a direct short to ground.

Re: Burnt fusible link - help [Re: MoparABE] #2552894
09/21/18 03:21 PM
09/21/18 03:21 PM
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DaveKanofsky Offline
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Thanks for the follow up!

I always appreciate hearing what the culprit was.


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'69 Daytona, '16 Plum Crazy Challenger, '12 Durango, '01 Sebring conv't

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Re: Burnt fusible link - help [Re: MoparABE] #2552909
09/21/18 04:00 PM
09/21/18 04:00 PM
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Calgary, Alberta Canada
a12rag Offline
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Glad you found it !!! . . .

Re: Burnt fusible link - help [Re: MoparABE] #2552915
09/21/18 04:21 PM
09/21/18 04:21 PM
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Posts: 3,535
Canuckville
68Cbarge Offline
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Originally Posted By MoparABE
Thanks for the help, I traced it to a bad alternator, it was shorted internally causing a direct short to ground.


I knew I was on the right track!
Glad you found it!
As mentioned before,leave the jumper wire in.
Also for added insurance, bypass the bulkhead connector for the MAIN red wire.


'68 Newport Custom Barge on a Budget!! BOAB
1973 Satellite WAGON! 318- 3 on the tree!!
2008 Chrysler 300c HEMI!






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