1990 4.0L hooked up booster cables backwards

[Comanchesummermoon]

 

 

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 

 

 

 

[Big_Mark]

Ouch!

Did you take a look at the fusable links? Hopefully they did their thing and broke.

[Comanchesummermoon]

3 hours ago, Big_Mark said:

Ouch!

Did you take a look at the fusable links? Hopefully they did their thing and broke.

Like the fuses under the dash? They are fine. There was one that blown but I replaced it and still nothing. Or are fusable links different? 

[Eagle]

Starts but dies? Bypass the fuel pump ballast resistor and get back to us.

 

[Comanchesummermoon]

1 hour ago, Eagle said:

Starts but dies? Bypass the fuel pump ballast resistor and get back to us.

 

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

[Pete M]

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. 

 

 

[cruiser54]

Fusible links like these on the solenoid/relay.

[cruiser54]

And, didn't you replace the fuse box? 

[Comanchesummermoon]

1 hour ago, cruiser54 said:

And, didn't you replace the fuse box? 

I actually changed the solenoid/relay that you have pictured. And still nothing 

[cruiser54]

so not the fusebox? 

[Comanchesummermoon]

1 hour ago, cruiser54 said:

so not the fusebox? 

No I didn’t. There was a blown one for the turn/bu but I changed it. 

[Big_Mark]

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

Fusible links like these on the solenoid/relay.

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.

[Eagle]

Any progress on checking the fusible links?

 

[Comanchesummermoon]

22 hours ago, Eagle said:

Any progress on checking the fusible links?

 

Yes I replaced all of the fusible links and it still does the same thing as before. I’m going to check the fuel pump harness for voltage 

[Elwiscon]

I know this is an old thread…Did the same thing on my MJ, did you find the issue? Thanks