L
lapnad
Guest
My 1992 Dodge ¾ ton truck is not charging. Could it be the ECU or Alternator?
I have a 1992 Dodge D250 truck with a 5.9 engine. One day it would not start. It would crank, but no spark, so I had it towed into the shop. After 3 weeks, the mechanic said the ecu computer was to blame. He replaced the computer and my son drove it home. My son said the check engine light was on when he got home (about 1 mile). I noticed the alt gauge was not right so I tested the battery and discovered the alternator wasn’t charging. About 30 seconds later, the alt gauge showed a charge and I confirmed it with my tester. The check engine light also went out. I drove it for about a mile and everything seemed fine.
My son left with it and called me about 5 minutes later to say it was not charging and the check engine light was on again! I installed a new alternator and still have the same problem! When I test the alternator I get the following results with the engine running.
Battery voltage and output at the alternator is 12.53 v(same with engine running or off)
The voltage at both field control wires is 12.01v
I bought the computer and the alternator at different parts stores. Of course, where I bought the computer, they blame the alternator and where I bought the alternator, they blame the computer!
Anyone have any suggestions?
The Dialogistic codes I get are 12-41-55
Where can I find a code list?
I have discovered that code 55 means “end of codes”
Code 12 is just telling me that the ECU was disconnected from the battery.
Now, code 41 means “Generator fields not switching properly” “an open or shorted condition detected in the generator field control circuit”.
Anyone care to explain that description?
Where I bought the alternator, they are telling me that it means the voltage regulator is bad an it is in the computer (ECU). I took the computer back and THEY are telling me the voltage regulator is in the alternator!
Anyone know for sure?
I have a 1992 Dodge D250 truck with a 5.9 engine. One day it would not start. It would crank, but no spark, so I had it towed into the shop. After 3 weeks, the mechanic said the ecu computer was to blame. He replaced the computer and my son drove it home. My son said the check engine light was on when he got home (about 1 mile). I noticed the alt gauge was not right so I tested the battery and discovered the alternator wasn’t charging. About 30 seconds later, the alt gauge showed a charge and I confirmed it with my tester. The check engine light also went out. I drove it for about a mile and everything seemed fine.
My son left with it and called me about 5 minutes later to say it was not charging and the check engine light was on again! I installed a new alternator and still have the same problem! When I test the alternator I get the following results with the engine running.
Battery voltage and output at the alternator is 12.53 v(same with engine running or off)
The voltage at both field control wires is 12.01v
I bought the computer and the alternator at different parts stores. Of course, where I bought the computer, they blame the alternator and where I bought the alternator, they blame the computer!
Anyone have any suggestions?
The Dialogistic codes I get are 12-41-55
Where can I find a code list?
I have discovered that code 55 means “end of codes”
Code 12 is just telling me that the ECU was disconnected from the battery.
Now, code 41 means “Generator fields not switching properly” “an open or shorted condition detected in the generator field control circuit”.
Anyone care to explain that description?
Where I bought the alternator, they are telling me that it means the voltage regulator is bad an it is in the computer (ECU). I took the computer back and THEY are telling me the voltage regulator is in the alternator!
Anyone know for sure?