The Universal manual says the glow plugs are six amps each, so 30 amps is probably fine for four plugs.See any issue with that?
That's definitely a better place to pull from. No always hot circuit, works off both batt banks. That is one "perty" engine Ken.Might be better to tap into the red wire that powers the engine panel
Your exhaust manifold, where you have the relay/solenoid bolted appears to be beautifully painted, so I still suspect the ground is poor. Try a simple jumper wire with alligator clips an clip to the body of the relay and to the back of the bolt which I see for securing the alternator belt tension. That may be a better ground connection. Otherwise you may need to scrape the paint off the spot where you bolt that thing.Well, that didn't work.
I installed the Cole-Hersey, mounted on the engine block. One end to the glow plugs, the other (temporarily) to the battery bank. Cockpit glow plug switch wire goes to one of the small poles.
When I push the glow plug button, nothing happens. No voltage drop on the voltmeter. No heating of the plugs.
I tried the cockpit panel glow plug button wire on each of the small poles. No dice. A hot wire direct from battery applied to either of them creates no click.
I figure the ground is good--one bolt only, but right on the engine. I wonder if, as another member found, the new solenoid is no good. Seems unlikely, however one of the small posts wobbles loose to the touch.
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But shouldn't the first glow plug get hot to the touch after a 20 second button-push?
I get voltage drop on the voltmeter of about 1 volt. Formerly it was more like a 2-volt drop.