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The hardy diesel digital volt/hz gauge can connect to any 120VAC source

I will leave it to those with first hand experience on this model, but it sounds to me like you may have it 1 full rotation out of time. A full cycle of the engine takes 2 turns of the crank, and therefore passes the timing mark twice, you may have it on the wrong part of the cycle. Also get...

I don't remember the answer for that, but I think the gauges are of the fixed ma range type (100ma?), it is likely marked on the back of the gauge, or in very very fine print on the face. Many older panel gauges use a fixed amp range (often .1 - .5Amps) to control needle position as this...

Mostly don't do anything stupid, which means you have all the usual dangers and you should treat it like any other engine when it comes to mechanical injury, plus any time it is running you should treat it as a live electrical circuit, in addition any time you are working around in the control...

If you want to you can ground the frame by running a suitable wire from the ground connection point on the frame to any good ground point you have available (meter water pipe, steel I beam, etc.) This can help protect you from some types of potential electrical shocks if there are certain faults...

Don't trust the panel gauges, check it from the output lugs or the front panel outlet, even a simple desk lamp can tell you a lot.

Hopefully it is just a dirty pot, but if not replacing transistor on the AVR board is fairly easy, it is the larger one that is soldered on and also held in place with 2 small screws and nuts. Simply remove the AVR board from the cabinet (rusted screws and need for box wrenches may slow you...

Voltage going high with it running under speed makes me suspect output transistor on the AVR board. Ike

I agree, when I see such problems the first thing I try to check is all the grounds.

It depends on the GL site, some are known for even bolted down parts to go missing between inspection and pick up, others are fairly good about site security.

One more thought, read the stencils and the labels that are the unit, they may include service dates, or an idea of how they may have been used. For example my MEP-002a has a "serviced 2008" stencilled note on the unit, this would at least imply things could have only been sitting up for less...

The electric fuel pumps also have screw off removable bottom plates with a filter inside. The old style filter is a mesh basket in a plastic framework, the new style is a white porous ceramic tube. The old style ones can be cleaned, I am not sure about the new style. Ike

Just a couple of more points, Take a look at the 3 electric fuel pumps, often these pumps will be damaged or missing on GL units, they also retail for about $150 each. While your there see if any of the accessories are still there: ground rod, drum bung adapter and pipe, remote fuel hose, or...

Voltage is going to drop as the engine looses rpms though

There are a variety of industrial safety units that should provide input to a relay to do what you want, take a look at time mark power monitors (you can often find cheap used ones one ebay, etc.) Ike

I can't comment too much on how common each are when going low. Both do happen, all I can say is it seems these voltage regulators seem to tend to die going high most of the time. Testing AC output will tell. Ike p.s. where are you in Louisiana?

Looks good, let us see how it goes once you have it mounted.

Like he said, you know you did it too long when you burn out the AC voltage regulator. We commonly get people on here that have the exact same feeling you do, they just don't usually show up until AFTER they have killed their voltage regulators. Why the army put a manual throttle that allows...

Well that is good news. Ike

It seems the more common failure on these battery charging regulators is to go high rather than low, often after a few minutes of run time and therefore cooking the batteries. Here is a simple test procedure for basic function: Check battery voltage before starting Start engine if battery...