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Well, move your way back toward the tactical relay box (P50, J10). It's either one of those plugs, or a loose connection/bad short circuit relay K13.

The next place to test would be the circuit breaker itself; remove the plug, find pin A, and do the same test (main switch "on", battleshort in battleshort, main breaker switch to close). If you get 24v there, the breaker itself is bad...if you don't, then it is either a connection at one of...

Uploaded a copy of p 345; highlighted S3 in blue. Highlighted in red the circuit path from S3 to the main breaker that we will be testing. Should help you find it on your schematic... Next test: Your main breaker switch is sending the necessary 24v; let's find out if it is getting to the...

OK; I just got done troubleshooting an -004a with a main breaker that would not close so I'm now VERY familiar with the circuit! A concrete construction company was using the set to power their site and the main breaker would intermittently open during operation and then not close again...

It just means that the main breaker isn't closing. The tests you did prove that it isn't just an indication problem; the breaker actually isn't closing. It should close with the battleshort switch on, regardless of whatever alarms are occurring. I'll take a quick look at the schematic later...

Not doubting you in any way, just wanting to make sure we're on the same page (hard to tell exactly what is going on when I'm not there in person watching things happen): 1. You started up the generator with the battleshort switch in "off" (shouldn't be able to start it with the BS switch in...

OK; after the set is running, place the battleshort switch in battleshort. Then try to close the main breaker again. Let us know if it closes or not. This will help to prove if the main breaker is working, and if there is a problem with the reverse power alarm circuitry...

The fact that your voltage meter is reading is a good sign; I suspect that nothing too serious is wrong. If you're trying to adjust frequency with the little knob on the control panel labelled "frequency adjust," it won't do anything on your generator. That control circuitry is nonexistent...

Might sound like a crazy question...but have you tried to reset it yet? I have worked on a few sets that developed spurious warning lights the first couple of times I ran them... After the set is running, just hit the lamp test/reset button for a second or so. It should reset. If it won't...