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Electrical 2nd Gen Dodge Ram Electrical Problems and Questions.


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  #1  
Old 10-22-2012, 05:09 PM
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Default Alternator?

My trucks not charging good. Awhile back the voltage guage went all the way down. Then it went full blast, now it's up a little. Could my alternator be going bad? It's got a new battery. It starts fine, runs fine...just not charging good!
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Old 10-22-2012, 05:15 PM
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Charging rate is partially determined by the battery temp sensor and controlled by the PCM. Either of these components along with faulty wiring or bad connections could cause your problem. The alternator is certainly a possibility, but the only way to be sure is to troubleshoot the problem while it's acting up. Having a scan tool to check for codes and reas the temp sensor data would be a big help.
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Old 10-22-2012, 05:58 PM
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Quote:
Originally Posted by RamTech View Post
Charging rate is partially determined by the battery temp sensor and controlled by the PCM. Either of these components along with faulty wiring or bad connections could cause your problem. The alternator is certainly a possibility, but the only way to be sure is to troubleshoot the problem while it's acting up. Having a scan tool to check for codes and reas the temp sensor data would be a big help.
I've been going by the codes you get from your odometer. One said that it wasn't charging enough...then another said that it was charging too much! Right now it reads PDONE
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Old 10-22-2012, 06:00 PM
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I would want a look at what the battery temp sensor is showing and the output that the PCM is seeing in the PCM data stream when it's acting up.
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Old 10-22-2012, 06:50 PM
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Ok.....went and started my truck. I turned everything on. Lights, AC, stereo. The guaged dropped. Check Engine light came on. Didn't show no code though.
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Old 10-22-2012, 07:37 PM
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If the MIL is on, a code will be stored. You probably need a scan tool capable of manufacturer specific codes to read it.
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Old 10-23-2012, 01:32 PM
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Well, I drove my truck to AutoZone. Yesterday it showed the code P1682. This is what the peice of paper they gave me said: "Engine running and the ECM detected the charging system voltage was not within 1 volt of target value.

Probable cause:
Poor connection at generator (i take this to mean alternator)
Poor electrical connection in electrical system
Failed generator"
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Old 10-23-2012, 01:42 PM
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Their list for probable causes is a bit generic. Here is Chyslers list of possible causes.

GENERATOR FIELD TERMINALS VOLTAGE BELOW 3.0 VOLTS
B (+) CIRCUIT HIGH RESISTANCE
GENERATOR GROUND HIGH RESISTANCE
GENERATOR FIELD DRIVER CIRCUIT OPEN
GENERATOR FIELD DRIVER CIRCUIT SHORTED TO GROUND
GENERATOR FIELD SOURCE CIRCUIT OPEN
GENERATOR FIELD SOURCE CIRCUIT SHORTED TO GROUND
BTS
POWERTRAIN CONTROL MODULE

The diagnostic for this code is 4 pages and requires a DRB III scan tool or equivilent and a volt meter. You can roll the dice with an alternator, but don't be surprised if it doesn't fix it.

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Old 10-25-2012, 04:16 PM
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Got her fixed!!!! She's a charging good now!! It was one of the fuses up under the hood! The alternator fuse I thinks what he said!!!!
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Old 10-25-2012, 04:24 PM
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I'm glad that you got your Ram fixed

By the way, i like your town, i spent a weekend there last year, during XMAS in JULY
it was a wild weekend, lots of Harleys
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