- May 28, 2014
- 839
OK well as stated in the title the alternator does not charge at all, it started Monday afternoon on my lunch break after stopping to get food and coming back to the truck, the battery light was on and it gave the message battery not charging.
At first I checked all cables and wires and no difference, then I pulled the PCM fuses and still nothing, then I tried starting again this time I gave it a little Rev and then the alternator came back to life and started charging. Now the alternator doesn't charge at all yesterday I had to Rev it a lot more to get it to do anything
http://www.duramaxdiesels.com/forum/showthread.php?t=34711
According to what I found the PCM is supposed to give no more than one volt with key on engine off but I've gotten 5 volts, I've even tried the pin directly on the PCM and got 5 volts. But for some reason now I seem to be getting 1.3 volts.
Yesterday I took it to autozone and they tested the alternator and it came out fine when the engine was running good but their machine froze and I wasn't able to test it with the engine on and not charging.
I got a new PCM but it needs a security relearn and when I tried to do it the voltage of the battery drops fast for whatever reason.
I need all the help I can get with this one, it's not making any sense to me.
I'm going to try changing the alternator too, I know it won't make a difference but it's not like it'll hurt and there all spare parts either way
At first I checked all cables and wires and no difference, then I pulled the PCM fuses and still nothing, then I tried starting again this time I gave it a little Rev and then the alternator came back to life and started charging. Now the alternator doesn't charge at all yesterday I had to Rev it a lot more to get it to do anything
http://www.duramaxdiesels.com/forum/showthread.php?t=34711
According to what I found the PCM is supposed to give no more than one volt with key on engine off but I've gotten 5 volts, I've even tried the pin directly on the PCM and got 5 volts. But for some reason now I seem to be getting 1.3 volts.
Yesterday I took it to autozone and they tested the alternator and it came out fine when the engine was running good but their machine froze and I wasn't able to test it with the engine on and not charging.
I got a new PCM but it needs a security relearn and when I tried to do it the voltage of the battery drops fast for whatever reason.
I need all the help I can get with this one, it's not making any sense to me.
I'm going to try changing the alternator too, I know it won't make a difference but it's not like it'll hurt and there all spare parts either way