What is the procedure to discovering what my ECU is putting out for glow plug Voltage?

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

You could pop #1 off and put a voltmeter on it and cycle the key.

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Silver 2006 KJ 2.8L CRD Limited:
GDE ECO Tune / Fumoto Valve / E-Tecno GX3123 7v Glow Plugs / 2nd Gen Fuel Head / Mishimoto RED Hoses / Rockers/Lifters @ 114k / Hayden FC + 11 Blade Nylon / Sears P1 Battery / Transgo 45RFE-HD2 Reprogramming Kit / Timken Front Bearings

Probably not that simple as they're are driven with a PWM signal.

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It wouldn't really matter if it were MPPT (lol), if you have a voltmeter worth having (Not some $5 Harbor Freight junk) it should be able to measure peak, etc even if it's a pulse.

You just need to know your Duty Cycle information.

You could make a measurement tool with a pic micro and an LCD, but I'm probably getting too advanced for most with that statement.

It's very simple, really.

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Silver 2006 KJ 2.8L CRD Limited:
GDE ECO Tune / Fumoto Valve / E-Tecno GX3123 7v Glow Plugs / 2nd Gen Fuel Head / Mishimoto RED Hoses / Rockers/Lifters @ 114k / Hayden FC + 11 Blade Nylon / Sears P1 Battery / Transgo 45RFE-HD2 Reprogramming Kit / Timken Front Bearings