Trying to help my mechanic a little here. The Positive Battery Cable on my 300M (with the fusible link) is pulling too much juice from the alternator and killing batteries. When we've called dealership, they said the part is out of manufacture. Can't seem to find it online either, even to get the part number. Anyone have a suggestion on where to locate one? Or how I could get the part number? Y'all have been a big help previously. Thanks! Adam in Denver.

 

I am not certain I understand the issue. What is 'too much juice' from the alternator and how is this being determined? What are the symptoms other than a dead battery? The cable does not pull volts; it is simply a conduit/pipe.

 

Im not sure I fully understand the issue either. Mechanic says the alternator is registering 30 to 45 volts which is overwhelming the battery, killing the cells. Tried multiple alternators with same issue. With his research he determined it was the positive cable as culprit. So tried to find a replacement cable and has been unable to do so. Dealership said it's out of production and he couldn't find aftermarket.
I told him I'd go to the CF to see if I could find any ideas. Thought maybe others had similar issue before with an LH car or could get a lead on a replacement cable.
Hope that's a little clearer. Thanks

 

First trade in that Mochanic for a Technician. Next I fail to understand how that much voltage can be produced and or delivered by the alternator.
The field controls the output of the alternator and is controlled by the BCM via the SSR Fuse.
As far as the fusible link portion, any decent tech would be able to source and install universally available links.

 

I'm willing to give them some benefit of the doubt at this point. Since he couldn't identify the amperage of the fusible link he was uncomfortable just sourcing it generally. Said 95% of cars use the same, but there's a chance this one's different. Hence the hunt for the out of production cable.

I will pass along your comments, so thanks for weighing in. Might give another avenue to try.

Anyone have a source on the cable or help with a part #?

 

Battery Cable is 6 gauge, Fusible Link is 10g Fusible link wire. Can be spliced in if done properly. Original battery cable likely discontinued by Chrysler. Yard part questionable.
Still not understanding your voltage numbers, sure you don’t mean amps?

 

So talked with the mechanic again. The problem is the cable has gone bad at the fusible link, leading the alternator to feed voltage back to itself, resulting in the high 44ish volts.
Hesitancy is that each fusible link can spec 80-150 amp tolerance, despite the gauge. And we can't find out how much this one has (no marker on it) and no info from dealership. So it would be a dangerous guess.
So my next step is to salvage yard to see if I can get an old cable to try. Hoping I'll find one intact that will swap.
Thanks for the input. I'll let you know how it goes.

 

FSM Wiring diagrams indicate 10g link as I indicated in my last post.
Common electrical practices an entry level tech would know is to protect a circuit with a link 4 sizes smaller than the main wire. So the 6g wire would use 10g link.
Chance of finding a good one in a yard rather slim. The link has a tendency to corrode with time. If you find one, cut the insulation off and inspect. Should be copper color not green. Reseal with liquid electrical tape.

 

Thanks again for the input. I ended up getting a used cable from the yard and my shop installed it. Is working fine now.