Just bot an M35A3. Went to start it to bring it home, flipped on the accessory switch and it buzzed for about a second and went quiet. No power to the gauges, air pressure horn, starter switch. Headlights, heater fan etc work so it is not a battery issue. Previously worked fine. Where can I find a wiring diagram and can anyone help me troubleshoot this problem? I would like to get the truck home!!!!
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M35A3 No Electrical for Start
- Thread starter pbranch
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M35a3 wiring guru needed
Post #2 of the thread above has a wiring diagram , below is a link to the TM's
TM's for the Deuce
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wreckerman893
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Check all the grounds. If it is not even clicking the circuit is not complete.
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Lights can still work with a bad battery. Load test them.
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What makes you think it can't be a battery? All that stuff can still work but when trying to start it the battery will exhibit failure mode.
Start with the basics and go from there.
Voltmeter on battery and then load test it if possible. Even the el cheapo form Harbor Freight will give you the answer.
If it isn't the battery DISCONNECT battery then start going through the connections one by one cleaning and tightening like WM said. If you get a wrench across a live one to ground you'll be having a worse day.
Start with the basics and go from there.
Voltmeter on battery and then load test it if possible. Even the el cheapo form Harbor Freight will give you the answer.
If it isn't the battery DISCONNECT battery then start going through the connections one by one cleaning and tightening like WM said. If you get a wrench across a live one to ground you'll be having a worse day.
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Darn it Pete!
R Racing
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Check your power on switch. Mine did a simular thing and ended up being my power switch was bad.
R Racing
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You use a meter to check it to see if you have voltage on the output of the switch. I remember when I had figured out it was the switch I'd turn it off and on fast about a dozen times then my truck would start up.
Thanks to all who responded to my question especially for the wiring diagram!!
. Took a meter and checked the switch. 24 volts in and two of the three outputs on the accessory switch have power out, but the output powering gauges, buzzer, etc., is bad. Will have to order a new switch (suggestions?). I swapped the wire with a good terminal and have buzzer and gauges but starter only spins and does not engage. Pulled the batteries and will fully charge them, load test them, replace the switch and then try again.
. Took a meter and checked the switch. 24 volts in and two of the three outputs on the accessory switch have power out, but the output powering gauges, buzzer, etc., is bad. Will have to order a new switch (suggestions?). I swapped the wire with a good terminal and have buzzer and gauges but starter only spins and does not engage. Pulled the batteries and will fully charge them, load test them, replace the switch and then try again.RotorAV8R
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I had an intermittent issue with a wire connector plug. Mine has the alternator conversion so has a screw together plug I'll show you. It's on the firewall in the engine bay, driver side, above the steering shaft. It is a large connector and the wiring going in was loose. I also once had an issue with the wiring to the back of the main power/light control switch. The wires just push in and one had vibrated and backed out. I pushed them all in a little and that issue has stayed away thus far.
