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Mystery Charging Problem?!

 
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  #1 (permalink)  
Old 15 Dec 2011, 11:22 am
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Default Mystery Charging Problem?!

My PT, now over 200k miles, is having a mysterious charging problem. 2 new alternators later, new battery and new computer, and the battery still isn't being recharged. Autozone says the alternator output is fine and my PT isn't throwing any codes. Thought maybe it was voltage regulator, but new computer didn't help. Anyone have a clue as I'm at my wits end? (I'm also not very mechanically inclined but after this many miles am finding my way around.)
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Old 15 Dec 2011, 12:42 pm
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Default Re: Mystery Charging Problem?!

On the PT, the voltage regulator is built into the alternator. If the battery is good and the alternator output is fine, I'd look at your cables. Both ends. Look for any corrosion that can stop a charge from moving to and from the battery. At that kind of mileage it might be a good idea just to put new cables in.

Last edited by CREWZIN; 15 Dec 2011 at 12:49 pm.
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Old 15 Dec 2011, 12:46 pm
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Default Re: Mystery Charging Problem?!

couldnt have said it better my self!!!
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Old 15 Dec 2011, 05:41 pm
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Default Re: Mystery Charging Problem?!

Quote:
Originally Posted by CREWZIN View Post
On the PT, the voltage regulator is built into the alternator. If the battery is good and the alternator output is fine, I'd look at your cables. Both ends. Look for any corrosion that can stop a charge from moving to and from the battery. At that kind of mileage it might be a good idea just to put new cables in.
x3...make sure ALL the connections in the charging system are clean and tight. Don't overlook the ground side of the circuit. Cables can look good but be loaded with corrosion underneath the insulation thus creating a high resistance condition.

btw...the alternator field is controlled by a signal from the Powertrain Control Module (PCM), in other words, the computer provides the voltage regulation.
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Old 15 Dec 2011, 09:19 pm
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Default Re: Mystery Charging Problem?!

Quote:
Originally Posted by Carl48 View Post
btw...the alternator field is controlled by a signal from the Powertrain Control Module (PCM), in other words, the computer provides the voltage regulation.
QFT

and you can easily install and OLD mopar regulator (like 1975) if you need.

I'd guess your fusible link has failed.
Download a FSM (Factory Service manual) from internet and diagnose.
Any year will likely be good enough.
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Old 15 Dec 2011, 09:49 pm
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Default Re: Mystery Charging Problem?!

Thank you all for the responses. I'll change the cables and see if that fixes the issue and report back!
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Old 16 Dec 2011, 12:56 am
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Default Re: Mystery Charging Problem?!

Quote:
Originally Posted by UptownSport View Post

I'd guess your fusible link has failed.

x2...if the link has opened there will be no charging. It is a dark green wire according to the repair manual. Just something else to check out before throwing any more parts at it. Keep us posted.
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Old 16 Dec 2011, 11:20 am
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Default Re: Mystery Charging Problem?!

It's large gauge, again, I'd suggest you DL a factory service manual from the web
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Old 20 Dec 2011, 03:02 pm
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Default Re: Mystery Charging Problem?!

Ok, so I got a new battery wiring harness from the dealership for about $70. Installed and still have the same problem. The battery light continues to come on, even with jumper cables hooked up. (Side note: the check engine light is not on, however I did a scan and got a p0700 code.) I'm unfamiliar with the fusible link but I will look into that next as I'm at my wits end here!
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Old 20 Dec 2011, 04:27 pm
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Default Re: Mystery Charging Problem?!

I checked to make sure the green wire was connected to the starter, but I don't see any type of fuse along it. I did, however, find a wire that has a clip on the end of it but isn't plugged into anything, and can't see any place it should be plugged into?
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