M1008 no start

SnowPlowed

New member
7
11
3
Location
Fairbanks
Starter is good. Battery is good. Wiring is good. Is it possible that something with GP is keeping the signal from getting to the starter.
 

87cr250r

Well-known member
360
548
93
Location
Rodeo, Ca
These engines are very good at starting if you have a working glow plug system.

If the starter is spinning the engine you either have bad glow plugs or the injection pump is stuck in shutdown.

Do you see white smoke from the exhaust?
 

SnowPlowed

New member
7
11
3
Location
Fairbanks
Pulled the starter and bench tested it and it’s fine. Glow plugs work but no signal getting to starter to make it go. Turn the key to start and glow plugs come on but starter does not fire. Could it be the glow plug relay?
 

Barrman

Well-known member
4,885
980
113
Location
Giddings, Texas
I think we need some common terms.

The ignition switch has off, on and start.

The glow plug light should come on when you turn the key to on.

Then you have to hold the key in the start position.

If your starter is not working with the key in the start position. Then you get to check wiring. You can start with the small wire on the starter solenoid since you were just there checking the starter. It should have 24 volts only when someone holds the key in the start position.

If it does have 24 volts then your starter has issues. Even though you tested it.

If it doesn’t have 24 volts. Then follow the wire all the way across the engine and firewall to the plug at the back of the fuse panel. You will probably find nothing wrong until you get under the dash above the throttle pedal. The starter relay is located under where the radio would be in a civilian truck on a little plate.

It has 4 wires.
24 volts always hot.
Ground.
The wire to the starter solenoid
12 volt positive when the key is in start position.

If all of those wire do as described then the relay is bad. If the 12 volt start signal isn’t happening then it could be your ignition switch or the position of the ignition switch could have shifted causing it n to to work.
 

SnowPlowed

New member
7
11
3
Location
Fairbanks
I think we need some common terms.

The ignition switch has off, on and start.

The glow plug light should come on when you turn the key to on.

Then you have to hold the key in the start position.

If your starter is not working with the key in the start position. Then you get to check wiring. You can start with the small wire on the starter solenoid since you were just there checking the starter. It should have 24 volts only when someone holds the key in the start position.

If it does have 24 volts then your starter has issues. Even though you tested it.

If it doesn’t have 24 volts. Then follow the wire all the way across the engine and firewall to the plug at the back of the fuse panel. You will probably find nothing wrong until you get under the dash above the throttle pedal. The starter relay is located under where the radio would be in a civilian truck on a little plate.

It has 4 wires.
24 volts always hot.
Ground.
The wire to the starter solenoid
12 volt positive when the key is in start position.

If all of those wire do as described then the relay is bad. If the 12 volt start signal isn’t happening then it could be your ignition switch or the position of the ignition switch could have shifted causing it n to to work.
Thanks for that. Yeah it is a no start when the key is in the start position. Starter doesn’t spin or click or anything. I’ll start tracing wires and testing with the multimeter. Thanks for the help. I appreciate the specific details about the starter relay etc.
 
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