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1990 4.0L hooked up booster cables backwards


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So I went to boost my truck few days ago and I accidentally put the booster cables on backwards and then got in and turned it over, it made a horrible zing noise from the starter and my gauges went all crazy, I got out and changed the cables to normal and the gauges went back to normal but now it just turns over and sometimes starts and idles fine and even Revs fine but dies after 5 seconds, my relays also have a clicking to them after I try start it. All my fuses look fine and I even have Ksuspensions 250A fuse between the fuse block and the alternator and it blew so maybe that saved something. I already put in a different fuse block and didn’t change anything. I attached a video of the truck running fine but right after he video stops the truck dies instantly 

 

 

 

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1 hour ago, Comanchesummermoon said:

Bypass how? I know where it is but not sure how to bypass? 

 

on the drivers side of the engine bay on the fender wall is a white ceramic resistor maybe 3" long with 2 wires sticking out of it.  just put the wires directly together and bypass the resistor. 

 

 

Ballast Resistor.JPG

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On 10/31/2022 at 5:38 AM, cruiser54 said:

Fusible links like these on the solenoid/relay.

Starter relay.jpg

The Green wires in this picture are fusible links. They burn out when overloaded by design, kind of like a fuse, only they are wires.

When handling them, if they feel "floppy" / not stiff like a wire should be, then they are likely burnt out and will need to be replaced.

You could temporarily replace them with a similarly gauged wire for testing purposes. Just don't leave the temporary replacement in for the long term otherwise components upstream will burn out instead of the fusible link.

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