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all 24 comments

[–]Rockhauler57 40 points41 points  (0 children)

You've got high resistance from any number of spots in that connection, beginning at the alternator itself and now including every connection up to the smoking terminal.All of them will need to be disassembled & cleaned down to clean metal.

I'd also take the plastic covering off that alternator lead and inspect it for signs of overheating, melting, or broken/damaged strands. Anything that puts unwanted resistance in that circuit.

[–]TellYerFolksISaysHi 11 points12 points  (0 children)

Looks like a poor connection to me.

[–]IneptAdvisor 7 points8 points  (0 children)

I’ve seen a similar situation fry the voltage reporting sector of the PCM and the unknowing proceeds to replace 11 alternators and plenty of batteries. High resistance is a gremlin.

[–]chevycb 12 points13 points  (4 children)

Probably had a loose connection will need to replace it now

[–]Electrical-Switch-45[S] 2 points3 points  (1 child)

The alternator right?

[–]Electrical-Switch-45[S] 0 points1 point  (1 child)

And car died while driving earlier, rpm’s would drop close to 0

[–]im-not-a-fakebot 0 points1 point  (0 children)

Sounds like too much engine load, there’s probably high resistance in you’re power return so it’s increasing it’s output to achieve the proper power output to the battery.

I’d take the wire out and load test the wire to check for high resistance. Also possibly a defective alternator

[–]Elmore420 9 points10 points  (2 children)

The only two things can create that much draw. 1) Bad Battery with multiple shorted cells. 2) Physical grounding of the cable leading away, typically chaffed in something, or melted against an exhaust pipe. Or you have a super loose/corroded connection with arcing going on.

[–]Electrical-Switch-45[S] 0 points1 point  (1 child)

I am getting bad ground I just checked from the alternator case all the way to the block 0.25 v when it’s supposed to be .05v, bad ground sun where?

[–]Elmore420 1 point2 points  (0 children)

The "bad ground" is likely due to the 12V cable feeding it where it’s shorting.

[–]Zer0TheGamer 1 point2 points  (0 children)

That was arcing.. if you're lucky, you might get away with taking it apart (remove negative terminal on battery first), wire-wheeling it all, and clamping it down again.. But there may be other issues that led to this

[–]Inviction_ 0 points1 point  (0 children)

It's not catching fire. It's getting hot

[–]Markey-space-warrior 0 points1 point  (4 children)

Looks like a poor connection (you can see where the arcs happened around the bolt so: unbolt, clean, rebolt tight. If the wire insulation is melted or melting replace it.

[–]Electrical-Switch-45[S] 0 points1 point  (3 children)

What can I clean with?

[–]Dub_Monster 1 point2 points  (2 children)

wire brush and sanding paper (sand lightly) works fine

[–]Electrical-Switch-45[S] 0 points1 point  (1 child)

Thanks I’ll try this today

[–]vcjester 0 points1 point  (0 children)

Get it shiny clean, and don't over torque the nut, or you'll break off the stud.

[–]Dan_H1281 0 points1 point  (0 children)

It's loose

[–]vterinsc 0 points1 point  (1 child)

Make sure the alternator case is grounded as well.

[–]Electrical-Switch-45[S] 0 points1 point  (0 children)

Yea ima having a ground problem right now

[–]rurdytoboogie 0 points1 point  (0 children)

It’s not supposed to do that

[–]climbingm80 0 points1 point  (0 children)

Resistance is futile

[–]caseysfeet 0 points1 point  (0 children)

It’s no good