Switches

[ijchan223]

I am having some issues with a few M819s wrecker wiring. I am able to start the truck but the switch can not kill the engine.

I am unsure if the switch has been fooled with before so i do not know if it is installed correctly

 

[Ferroequinologist]

Sounds like your control box is failing, not the switch.

It is fairly common for the contacts to start sticking.

 

[steelandcanvas]

Here's a photo and schematic of the PCB.

Courtesy of Cranetruck

 

[m16ty]

It could also be the the fuel shutoff on the PT pump. Also make sure somebody hasn't fooled with the shutoff override screw. It should be screwed all the way out for the electric shutoff to work.

If you still have power on the wire going to the fuel shutoff with the switch in the off position, It's probably your control box.

 

[ijchan223]

It could also be the the fuel shutoff on the PT pump. Also make sure somebody hasn't fooled with the shutoff override screw. It should be screwed all the way out for the electric shutoff to work.

If you still have power on the wire going to the fuel shutoff with the switch in the off position, It's probably your control box.

Happen to have a image of the switch, i do not recall seeing a solenoid around the fuel pump area.

( i can be looking too hard for it)

 

[73m819]

Your fuel shut off, how are you shuting down now

The -10 shows the thumb screw

 

[m16ty]

Find your PT pump (injector pump). On the top of the pump there will be a solenoid with a wire attached to it. In front of the solenoid will be the manual shut off screw. It's a thumb screw but you can also use a stubby flat head screwdriver to turn it.

 

[ijchan223]

Find your PT pump (injector pump). On the top of the pump there will be a solenoid with a wire attached to it. In front of the solenoid will be the manual shut off screw. It's a thumb screw but you can also use a stubby flat head screwdriver to turn it.

I am currently shutting it down with the emergency fuel cutoff ( a mechanical valve). I may just be over looking the solenoid . Thanks for all the help

 

[doghead]

Look at post #4 in the link below.

http://www.steelsoldiers.com/5-ton-up/45733-starting-250-can.html#post513352

 

[ijchan223]

Find your PT pump (injector pump). On the top of the pump there will be a solenoid with a wire attached to it. In front of the solenoid will be the manual shut off screw. It's a thumb screw but you can also use a stubby flat head screwdriver to turn it.

Thankyou very much, it turns out that you are correct, the solenoid bypass was engaged. It turns out that I wasn't looking hard enough for the solenoid, on a few of the other trucks the solenoid sticks above the PT pump but this one was hidden behind a bracket that holds the cable for the throttle

 

[cranetruck]

Here's a photo and schematic of the PCB.

Courtesy of Cranetruck

Hmm...it's actually the control box without the PCB (my solution).

 

[steelandcanvas]

Hmm...it's actually the control box without the PCB (my solution).

Sorry CT, I knew that, I should have put "Cranetruck's solution". Just another SandC brainfart. Hopefully he doesn't open his up and say "mine doesn't look like that!"