Ignition switch

Auto hauling · Jul 13, 2023

lester said: ↑

Could be your cam or crankshaft position sensor. I believe an MBN uses both. If one looses signal it will hiccup for just a second and then just use the other sensor. If it looses both it won't run. I don't think this sounds like your problem though.
I had one of the sensors go bad. When you started the truck it would cut out for just a split second and then come back to life and be fine the rest of the day
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Yes , I unplugged both sensors, cam and crank one at a time, and truck stayed running , that means that both sensors are healthy. Thank you for dropping by

Kgudriq · Jan 2, 2024

Goodysnap said: ↑

You say you have checked power and ground to the ECM, but how?

Put a sealed beam headlamp on the circuits and shakedown the wiring for the light to go out. From the ECM all the back to the batteries.
Click to expand...

What is the headlight method?

Goodysnap · Jan 2, 2024

Kgudriq said: ↑

What is the headlight method?
Click to expand...

Connect a simple sealed beam headlight to the power supply circuit and then to ground. If the light works your circuit is able to carry enough amperage to power the device and is considered good condition. If the light is dim or goes out you have excessive resistance causing voltage to drop and is not able to power the device.

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