FLD120 no start, no cab gauges

Cardo2g · Apr 26, 2019

cfannin1 said: ↑

99 FLD 120 with 60 series detroit. Parked up Monday and did the walk around. All was great. Tuesday morning, no gauges, no start. It will turn over but not crank. I have checked the following: hot and ground leaving battery, including in line fuse; power plug to ECM ground and positive are good; data link - and + in vehicle harness; switch key run and crank mode are good; physically exchanged ECM and EDM with no results; cleaned and inspected all grounds to motor and frame; tested ground and hot for breakers and relays in the cab panel. I have no clue where to go from here. What the heck powers everything in the cab and can keep the truck from starting? It's like I'm missing a relay/breaker/solonoid or something that I'm not finding. Any help appreciated.
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I was curious and wondering if you figured out what was the problem on your truck

ClassicXL5885 · Sep 16, 2019

Did he get it fix

Asalinas2y · May 31, 2023

GrapeApe said: ↑

Even if the relay is good, if it doesn't have power or ground to activate it, it wont work, which is why a said to try and jump it. Everything that gets key on power comes through that relay, so that's where I'd focus. You said you have good power and ground to the ECM, so I'm guessing that the ignition power is not making it to the ECM to turn it on. That comes from the ignition relay, which also powers all the other ignition on circuits.

On the ignition relay, you should have power on the 30 terminal. 85 and 86 are the coil to activate the relay, so one should have power and the other ground with the key on. The 87 terminal powers all the ignition circuits and relays.
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You have schematic on this. I can't seem to find it on the wiring diagram that was in the truck.

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