Ronmar
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His is an A1R…
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2009 Lmtv M1078A1 Charging System
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Ronmar
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Dave did you find 24v on pin 30 of relay K11?
Dave21
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Thanks I’ll keep looking.
coachgeo
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ahhhh... sorry did not realize your's was an A1R.... the A1R schematic is NOT on here..... Just the A0 via TM's and the A1 a pull out from a TM somewhere.
Dave21
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Thanks for looking.
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Yeah I share your pain….
Me too! I just replaced all four batteries in my 2009 M1093a1. I was very happy because I managed to get the truck running after it had been sitting in my driveway for a year. I then noticed the "no charge" light came on. The two voltage gauges on the dash (the 24-volt and 12-volt) both remained in the yellow range around the 24 and 12 volt position respectively. I was very unhappy because my truck only has 5900 miles and not even broken in yet. I was about to take pictures and post them here for others to see when I realized that I have three wasp nests in my truck.
Anyway, I plan on reading other posts to see if a solution is already posted.
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Fold the cab see what color leds are flashing on the alternator regulator.
Ronmar
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What superman said. No lights on the reg means either it isn’t getting excite power from K11 after the engine reaches 15 PSI oil pressure, or it has an issue. Green would be good, yellow low volt and red overvolt. I suspect they are either not lit or yellow otherwise the volt meter should be closer to 14/28V
That dash no charge light is actually driven by the LBCD which is located behind the cab…
That dash no charge light is actually driven by the LBCD which is located behind the cab…
Thank you all for your comments. I did as you suggested and raised the cab after starting the truck. I did not see any lights on the alternator while the truck was running. I took pictures of the gauges, the display panel showing the no charge light and the LBCD.
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The dump body and van door lights would seem to be mutually exclusive, interesting. With that much weirdness, I'd suspect a chewed harness or a bad ground, but I don't have an A1 so I'm not much help. I hope you get it sorted.
Ronmar
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No LED on the regulator means it isnt being told to come online(or broke). With the cab up and engine running, do you have 24v on the 24v alt output terminal?
if so you can use a jumper wire to apply 24v from the 24v terminal to the EXC screw terminal on the regulator. The exc terminal is the one forward/closest to the pulley. The leds should come on then. If they do not with 24 applied directly, the reg may be bad.
if so you can use a jumper wire to apply 24v from the 24v terminal to the EXC screw terminal on the regulator. The exc terminal is the one forward/closest to the pulley. The leds should come on then. If they do not with 24 applied directly, the reg may be bad.
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Ok ok.
pull your dash panel, unplug 912/913 I think are the numbers. They look like they should be together but they are for dump body and van body options. Cause ALL KINDS of gremlins when connected together.
I would be very disap
Ok. I pulled the dash panel, K11 and the Dump bed fuse. Everything looks new. Any ideas how I can test the relays and fuses to see if they are in good working order?
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No. Pull your gauge panel. Two large white plugs that look like they should be plugged into each other need to be unplugged. Those dump body and van alarms point right to that.
Ronmar
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Yea the plugs he is referring to are under/behind the instrument panel. If you loosen the knob and raise/tilt the steering wheel as far up and back as it will go, you should be able to remove all the panel bolts and raise the top enough to access the wiring harness. You are looking for some plastic molded plugs, about 1” square. they will have aluminum label bands on them identifying them as 912 and 913.
If they are plugged together, separate them, set the panel back in place, apply power and see if the dump lights are still lit. If they are cleared, start the truck and see if the charging fail light clears and if your voltages return to a proper 14.1 and 28.2V.
If they are plugged together, separate them, set the panel back in place, apply power and see if the dump lights are still lit. If they are cleared, start the truck and see if the charging fail light clears and if your voltages return to a proper 14.1 and 28.2V.
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How did you make out?