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Onan 4000w 4.0bf3cr16000b (R1 Resistor)


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  #11  
Old 10-10-2017, 06:45:55 PM
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Onan Dan Onan Dan is offline
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Default Re: Onan 4000w 4.0bf3cr16000b (R1 resistor)

yes it is possible that it could .. to get hot to the point to melt the resistor you must be getting some really high currant somehow like you said to maybe a bad resistor. I would double check all the wiring and be sure you do not have a hot wire somewhere to ground. The diode is what keeps the battery from discharging when setting dc currant goes one direction.
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Old 10-10-2017, 09:48:22 PM
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Default Re: Onan 4000w 4.0bf3cr16000b (R1 resistor)

If diode is shorted you will get high amps and no cooling from fan since engine is not turning.

Easy to test the diode, disconnect one end and measure with ohms meter. Should get conduction in one direction and none in other. https://www.smokstak.com/forum/attac...4&d=1344478607
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Old 10-11-2017, 10:23:53 AM
JohnnyJeeper JohnnyJeeper is offline
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Default Re: Onan 4000w 4.0bf3cr16000b (R1 resistor)

Thanks for all the info, I will recheck all my wires and test that diode and take it from there...I will post what I find.
Thanks again, J
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Old 10-14-2017, 03:29:30 PM
JohnnyJeeper JohnnyJeeper is offline
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Default Re: Onan 4000w 4.0bf3cr16000b (R1 resistor)

Ok, all wires are good tested the diode it reads 0 in one direction and around 7.68 in the other direction, so i guess its good, i found a new diode online so i went ahead and ordered it (discontinued part not easy to find so got one anyway) any other ideas or suggestions?
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Old 10-14-2017, 11:00:04 PM
JRinkenberg JRinkenberg is offline
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Default Re: Onan 4000w 4.0bf3cr16000b (R1 resistor)

I am having the same problem on my generator (4.0 BF-3CR16000B) as you. An open diode and a burned out resistor R1. I checked the parts list and it is part #353-0057 as stated but it is listed at 3.4 ohms and 75 watts. My question for you is where did you pick up/order the resistor and diode? I am looking to buy one of each to fix my same problem.
Thanks
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Old 10-14-2017, 11:37:53 PM
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Default Re: Onan 4000w 4.0bf3cr16000b (R1 resistor)

Hello,
I found the resistor on ebay ( tims truck mobile truck repair) the diode was harder to find i found 1 one ebay but it was the last one and it was $38 there is another place online that had it for around $50 try searching part number 305-0673 that replaced the old part number...
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Old 10-14-2017, 11:48:27 PM
len k len k is offline
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Default Re: Onan 4000w 4.0bf3cr16000b (R1 resistor)

A resistor is a$5-8 comodity item item, before you add many layers of excess profits.

Find the ohms, wattage, and convient mounting and look on ebay for a generic.
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Old 10-14-2017, 11:57:41 PM
JohnnyJeeper JohnnyJeeper is offline
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Default Re: Onan 4000w 4.0bf3cr16000b (R1 resistor)

I paid $11 For the resistor but the diode was harder to find and was $38 i think the extra $$$ is for the fancy Onan box it comes in...
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Old 10-15-2017, 01:49:40 AM
len k len k is offline
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Default Re: Onan 4000w 4.0bf3cr16000b (R1 resistor)

Same issue for a diode it's a commodity item, they are sold by PIV voltage , amps, and style of mounting terminals $2-5 item. Maybe 30 cents in high quantities of 50,000 units that manufacturers buy in

Last edited by len k; 10-15-2017 at 12:42:18 PM.
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Old 10-15-2017, 08:36:39 AM
Chas183 Chas183 is offline
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Default Re: Onan 4000w 4.0bf3cr16000b (R1 resistor)

Can't recall which staker posted this link, but a bridge rectifier has four diodes,
With this model in the link. You can mount it and have a spare.
Just use two terminals of the bridge rectifier in the correct direction.

http://www.ebay.com/itm/4X-4-PCS-50A...19.m1438.l2649

chas183
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