Grounds and batteries clean, good, and tight. Batteries at 25.5volts. 1987 6.5 na that went to Maine in 2006 for rebuild. I replaced the 60 amp with a 200 about 2 months ago and everything's fine. Today I went to start and the light blinked once and then no power. None at all when I turn the switch to run or start. I have read the glow plug gospel thread and can't seem to find help there. I have the white label (I think natron) S3. I have 24 volts at starter and 24 volts at gen. I checked for voltage at the top pcb connection and the middle hole has 23 volts. I can't read the numbers or letters to tell you what the hole is labeled. After connecting the plug I disconnected the negative battery again and pulled the bottom pcb plug. After re connecting the batteries one of the bottom right pins on the box was reading 23 volts. Again I couldn't read what pin it was on the connector. The other ones were reading 0. No lights work and neither will the heater. The weird thing is that I have 24 volt lights in the back that I turn on with an aftermarket toggle. It is hooked up with a 30 amp fuse. They won't turn on either and the fuse is fine. I even tried taking that connector off the batteries to see if that was the problem and it wasn't. Since that connection won't work it leads me to believe that it is a battery problem, but seeing they are reading fine and putting out power to the starter and gen I don't think it is the batteries. I've looked at the schematics in the tm but I don't know how to read them. Maybe someone can help me there. Thanks for all your help. You guys are great!
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