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Onan 4.5BGDFB30502M wiring hookup diagram or schematic?


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  #1  
Old 04-11-2017, 05:27:53 PM
Bobcat07 Bobcat07 is offline
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Default Onan 4.5BGDFB30502M wiring hookup diagram or schematic?

I got a 1200hr old gen on a truck i bought and it ran, kinda, and made power, kinda but now i want to sell it and need to run for the next owner.
I turned on the switch in the cab, hit the start button and with a little hand-choking, it started and ran really well. It would shut down after a minute or so but, restart easily, running for a shorter and shorter time after initial warm-up. Tried hooking a electric drill to the existing output and as long as i kept the drill running, the gen ran... albeit weakly. 100vac or so. Im pretty sure the rings and brushes are marginal and that's the shut-down problem.
But... I have someone interested in buying it and i would like to just start it on the tailgate, now that i have already disconnected all the wires, and could use a wiring diagram. I see the red wire that energizes a couple relays and I'm pretty sure about the two L1,L2 wires. Oem wire tags are still there.
Also... what's this thing worth? 12xx hrs. Rusty shroud. Has a hydraulic pump and bracket included. Probably 1999 vintage.

4.5BGDFB30502M
E990 908351

Thanks!
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Old 04-11-2017, 05:39:18 PM
len k len k is offline
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Default Re: Onan 4.5BGDFB30502M wiring hookup diagram or schematic?

Clean the skip rings and it might make full 120VAC again.
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Old 04-12-2017, 07:23:54 AM
Kevin K Kevin K is offline
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Default Re: Onan 4.5BGDFB30502M wiring hookup diagram or schematic?

Your generator was made in May (E) of 1999 (99). 611-1257 should be your wiring diagram.

As to what it's worth, that varies considerably with the part of the country and time of year. For the best price put a little work and a few parts into it to get it running well, and be prepared to demonstrate it to prospective purchasers. Put a socket on the output and plug in an electric heater to show it produces power. Or a corded drill. I don't know what the attraction of plugging in a drill is, but so many people seem to do it.

You can download manuals here: http://www.twinslan.net/~n0nas/manuals/onan/

965-0175 Operator
965-0632 Install
965-0228 Parts
965-0500 Service
Attached Files
File Type: pdf 611-1257.pdf (146.8 KB, 18 views)
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Old 04-12-2017, 12:45:27 PM
len k len k is offline
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Default Re: Onan 4.5BGDFB30502M wiring hookup diagram or schematic?

Running heaters is a good way to show makes full power. But running a grinder or skill saw is more noisy and impressive than heat, even though it takes hardly any power . I suppose a noisy shop vac might impress some people even.
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Old 04-15-2017, 09:05:27 AM
Bobcat07 Bobcat07 is offline
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Default Re: Onan 4.5BGDFB30502M wiring hookup diagram or schematic?

Wow, thanks for the info. I did search but never found the correct stuff.
Thanks again!
I just showed it yesterday and had a drill out just for that purpose but now i get no power at all. No batt charge.
Im going to start with brushes and cleaning the rings. It looks like heck, but runs so nice I hate to send it down the road cheap.
Thanks again, what would we do without a resource like this and folks like you.
Rob
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Old 04-15-2017, 12:52:31 PM
len k len k is offline
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Default Re: Onan 4.5BGDFB30502M wiring hookup diagram or schematic?

check that brushes are not broke, stuck , or worn.

If it doesn't make power check that AC voltage reg pin 7 recieves ~9-13 VDC (flashing) from control board when you try to start engine.

then with engine off, AC voltaeg reg unplugged, measure resistance across slip rings, should be 20.25-24.75 ohms. And > ~ 1,000,000 ohms to frame (insulation test).

If good, measure resistance between brushes, should be < 30 ohms, typically same as slip ring to slip ring ohms. If higher clean rings with scotchprite pad.

See if it makes AC, there is another test before you buy a new reg.
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Old 05-18-2017, 11:53:03 AM
Bobcat07 Bobcat07 is offline
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Default Re: Onan 4.5BGDFB30502M wiring hookup diagram or schematic?

My VOM wasn't working and i had a delay in getting a new one... and that pesky work thing...
But... I cleaned the rings and hsve great power, put a heat gun on and made great heat on high, looks like that is solved.
But... I still see the 12v batt voltage dropping as it runs...? Like it isn't charging or more correctly re-charging the starting battery.
Is this a seperate Volt reg or is it a motor issue like a magneto on th engine itself?
Sorry for yhe delay but my old vom was makin me pull my hair out! The drill would run but not the heat gun, but the meter read just millivolts of AC power. Drove me nuts until i went to the wall outlet and, tada bad meter!
Thanks again for all your help!
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Old 05-18-2017, 12:18:35 PM
len k len k is offline
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Default Re: Onan 4.5BGDFB30502M wiring hookup diagram or schematic?

For charging bat this gen has a PMG (permenant magnet generator) and VR2 ( DC voltage regulator #2)

Looks like the PMG is mounted under the flywheel. See parts manual 940--0229 paper page 14.

VR2 #305−0784 ( ~ $220) is item 11 shown on paper page 31 of that manual.

Check if you have AC out the PMG, and check for dirty connections and ground to VR2.

If VR2 is bad and have AC out from PMG may be able to replace VR2 with a diode bridge and fixed resistor for charging bat. Onan uses this design for the NHE units for RVs. If you do this route I'ld be interested in knowing what the AC voltage out the PMG is. Selection of resistor ohms will depend on AC voltage, it's likely different than on NHE gens. I think your shooting for ~ 1/2 to 1 amp INTO BAT, gen also requires another 3-8 amps to supply spark, fuel pump, gov actuator, and controls

Googal Harbor Fright ads, they frequently have a free $15 VOM meter (with other purchase). It's a cheeppie, you get what you pay for.

Last edited by len k; 05-18-2017 at 04:01:00 PM.
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