That be the one or very similar to what i have seen in days gone by.

"Brings back memories swoop and the first lift that comes to mind is the old Hyster Challengers with flaming manifolds. Kinda like those myself."

I remember working on some Cummins engines in 1970 (highway trucks) that had a cold start option package.
In addition to a fully functional, manually operated compression release, there was an intake manifold preheater feature.
The preheater had a glow plug to initiate the "burn" with a small Diesel fuel spray nozzle fed by a hand operated plunger type pump that was mounted on the dashboard (or on the shift tower panel if a cab over truck). When the hand pump was operated fuel sprayed out of the nozzle and across the hot glow plug. Some of the fuel would actually burst into flame, but most of it just got vaporized. The combination of heated air and heated fuel vapor made it easier for the compression ignition process to begin.
I remember being a kid (just out of high school) being instructed by my new boss about how to use the cold starting aid.
1, turn on the glow plug switch. Count to twenty.
2, after twenty, begin operating the hand pump plunger.
3, after about 4 or 5 strokes of the pump, pull hard on the compression release control lever/**** and crank the engine with the key switch.
4, after the engine spins up in its decompressed state, let go of the compression release. If the engine begins to run, resume operating the hand pump slowly until the engine idles smoothly. If engine fails to run, repeat all the first 4 steps.
Turn off the glow plug when the engine begins to idle smoothly.

So, RCAV8OR...........did the "flaming manifold" Hyster set up work something like that? or am I missing the mark?

The glow plugs usually either work correctly or not at all. We recently had an issue on a low hour truck and the relay was bad.

Just a fyi..
On the newer equipment, the glow (QGS) controller for the glow system is built into the VCM. Also, the newer trucks with the QD32 engine only use's one relay where as the older models used two.

Brings back memories swoop and the first lift that comes to mind is the old Hyster Challengers with flaming manifolds. Kinda like those myself.

just about all glow plug circuits i've ever dealt with use a relay and a timer...
turn on the ignition and wait 5 to 10 secs approximatly and also should be some kind of indicator light on the dash...
when the glow plugs are in heatup mode the light will be on....
when the light goes out then the engine is ready to start

now if this is an older glow start system it may have a glow plug in the intake and a fuel line running to it
it actually pumps fuel into the intake and ignites it to heat up the intake chamber.
would have to be a really old truck though... havn't seen those in years.

I replaced that to the tune of 1,100.00 bucks, but was warm when I installed it. It had been short cycling for some time and I wired in a push button switch for manual use with careful instruction on how to use. I haven't heard back. Thanks

without serial number it is just a wag, but more often than not, it is a time delay relay.