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That I did, and they were made the same month they were installed, factory fresh.
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These engines and radiator can be flushed and drained. There is a petcock drain at the lower corner of the radiator, and one on the engine block near the fan belt. Just follow the black hoses from the coolant tank, and you will find both.
When I drain and refill one of these, I always do so with the roof off, and thermostat out. After its been flushed, I backfill the system through the water pump to level, then reassemble, and tip the machine and finish at the radiator neck. Its still not foolproof... but it helps.
Pro tip, Never take the battery cable off of the battery while the engine is running in anything equipped with an alternator!!!! The resultant spike can take out all kinds of electronics on the vehicle/machine. This was something they did back in the days of generators on cars and it worked fine there, They produced 13.5 volts of DC power and that was it. An alternator produces higher voltage and it is also AC voltage which is converted by the diodes in the alternator. Which are one of the first things to give up the magic smoke when you do that.
Presently, I don't have access to a forklift. Excavator is still down. A high pressure line in the rotex burst open. Repair is going to need financing, as I've zero savings at this point.Floor jack and lumber, tractor with forks, engine stand with a chain... only pick it up 4-5" on one side to tip it.
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Do this test and write in what measurements you recorded, in red text color.
I am going to go out in a bit and watch my voltmeter on my 003 and see what it does. It does not swing that I know of and those batteries on that set are FAR from new, they were having trouble in my Dodge diesel so I relegated them to this genset and they have no problems with it.
Just as an FYI, don't compare an 003 to an 803, the charging and gage systems are completely different.
803 uses an alternator and an ammeter, the 003 uses a small stator under the flywheel and a volt gage ( as you stated ) on the control panel, so an 003 only shows battery voltage, not charging or discharging current so it never swings very much at all.
And yet you are fighting everything that is said? We are trying to help but you seem to want to contradict all that is said. These sets are going for 3-5 grand right now, I don't know what you paid but they are 25 plus years old. Stuff goes bad. A volt meter will cost probably 25 bucks? If you need it for someone else to see what is happening put a simple digital meter in wired directly to the batteries. You will not get anymore accurate than that.
That is the last piece of advice I have to offer. Other than if you really wanted something that is spot on user friendly you should have gotten a consumer use standby system that starts automatically, transfers automatically and shuts down when power is restored.