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Onan Generators

Need help figuring out what type of generator this is


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  #1  
Old 01-31-2009, 10:41 PM
Amily95 Amily95 is offline
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Default Need help figuring out what type of generator this is

hello and thanks for any help
i have a old onan generator given to me free it all seams good just some very bad hacking on the four large gauge leads that come out of the control box.
2 are for battery i know the other 2 have been cut flush to the whether pack nuts and i have know idea what they are . the motor and gen set turn sooth and the eng. is building comp. so it seams all good ther but i replace the 2 known battery wires but i don't know witch is pos. and witch is neg . i applied power to the leads but nothing happened when i pressed the start button . i think its a wiring issue but i need to find a diagram of the wiring in the control box . i see the 3 large gauge wires coming from the motor and they are labeled with steel tags like a1 s1 . ther is a ford style (not a real ford ) solenoidal . here is all the info off of the metal id plate
m#
205AJ-1E3900/4155H
ser.#
104784315
ac = 115v
phase 1
k.v.a 1.25
watts 1250

dc
volts 8.3
amps 300
watts 2500
bat. 12
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Old 01-31-2009, 11:19 PM
flyag1 flyag1 is offline
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Default Re: Need help figuring out what type of generator this is

Quote:
Originally Posted by Amily95 View Post
hello and thanks for any help
i have a old onan generator given to me free it all seams good just some very bad hacking on the four large gauge leads that come out of the control box.
2 are for battery i know the other 2 have been cut flush to the whether pack nuts and i have know idea what they are . the motor and gen set turn sooth and the eng. is building comp. so it seams all good ther but i replace the 2 known battery wires but i don't know witch is pos. and witch is neg . i applied power to the leads but nothing happened when i pressed the start button . i think its a wiring issue but i need to find a diagram of the wiring in the control box . i see the 3 large gauge wires coming from the motor and they are labeled with steel tags like a1 s1 . ther is a ford style (not a real ford ) solenoidal . here is all the info off of the metal id plate
m#
205AJ-1E3900/4155H
ser.#
104784315
ac = 115v
phase 1
k.v.a 1.25
watts 1250

dc
volts 8.3
amps 300
watts 2500
bat. 12
Dude whatever you do, please don't BBQ in the house! I've seen a lot on the news about peeps doing that...during this ice storm.
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Old 02-01-2009, 12:05 AM
David W. David W. is offline
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Default Re: Need help figuring out what type of generator this is

Looks as if you've got an early AJ genset. Solid machine, but a 3600 RPM variety, which will make it louder than an 1800 one. Cast iron block which ought to last forever. Somebody with a wireing diagram ought to be along before too long and can help you with that concern. Just be careful until they do.

The following link may be benficial.
Click here: Precise Engine Repair - Cummins Onan Engines, Generators and Parts

David W.
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Old 02-01-2009, 12:19 AM
flyag1 flyag1 is offline
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Default Re: Need help figuring out what type of generator this is

Quote:
Originally Posted by David W. View Post
Looks as if you've got an early AJ genset. Solid machine, but a 3600 RPM variety, which will make it louder than an 1800 one. Cast iron block which ought to last forever. Somebody with a wireing diagram ought to be along before too long and can help you with that concern. Just be careful until they do.

The following link may be benficial.
Click here: Precise Engine Repair - Cummins Onan Engines, Generators and Parts

David W.
David, there is no link?
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  #5  
Old 02-01-2009, 01:51 AM
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onanparts onanparts is offline
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Default Re: Need help figuring out what type of generator this is

Amily95, I have the operators and parts manual for your Portastart in PDF. PM your email and I'll send it along.

TJ
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Old 02-01-2009, 01:01 PM
Amily95 Amily95 is offline
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Default Re: Need help figuring out what type of generator this is

na i do have a onan 10k gen. running my house as we speak dam ice storm . and i never set the generators or any gas unit within 10 ft of the house .

this just seamed to good to go to the scrap yard . and as far as noise i am going to build an enclosure (not totally sealed just to protect it from the weather and make it easier to move ) and line it with dynamat sound dampener . and also line the tank and some minor spots all around the unit . this stuff will kill sound like no other . i put a 12 by 12 square of it on the enclosure of my 10 k unit and is sounded like i added a lead plate . make sure to use the type for engine firewalls because it can stand up to allot more heat
http://www.dynamat.com/products_auto...remeliner.html
and thanks to all for the help
if i read it wright it is a 2k unit but the dating is what through s me
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Old 02-01-2009, 02:53 PM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Need help figuring out what type of generator this is

TJ could you send me that also.
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Old 02-01-2009, 07:09 PM
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onanparts onanparts is offline
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Default Re: Need help figuring out what type of generator this is

Not until you admit hanging out at Taco Bell...

TJ
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Old 02-01-2009, 07:14 PM
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Default Re: Need help figuring out what type of generator this is

Who told you I was hanging out at Taco Bell. They lied. I am only there four times a week and twice on Saturday. Thanks for the book.
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Old 02-01-2009, 07:19 PM
Amily95 Amily95 is offline
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Default Re: Need help figuring out what type of generator this is

thanks tj that help fix some of the issues but i still cant figure witch wires to hook the pos and neg battery terminals to ther is 3 wires coming from the gen. one has A1 A2 .S1 goes to the start button the A2 goes to the starter solenoid A3 goes to a pc board
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Old 02-01-2009, 09:06 PM
Amily95 Amily95 is offline
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Default Re: Need help figuring out what type of generator this is

here is som pics of the gen





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Old 02-01-2009, 09:11 PM
Amily95 Amily95 is offline
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Default Re: Need help figuring out what type of generator this is

if i can figure out witch wires to hook to i can get ride of the rest and modernize the control system but im not sure witch ones to power to start the motor a1 a2 or s1
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Old 02-01-2009, 11:04 PM
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Default Re: Need help figuring out what type of generator this is

I will call on Monday and see if I can get a print.
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Old 02-03-2009, 09:17 AM
Amily95 Amily95 is offline
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Default Re: Need help figuring out what type of generator this is

just giving it a bump to find out witch wires need to be powerd to start the gen. do i need to power a1 and a2 pos. and s1 neg. or revers ore one of the a wires
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Old 02-03-2009, 10:24 AM
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Default Re: Need help figuring out what type of generator this is

From what I see the black wire is B-and red Is B+ on the battery. Still waiting on print information.
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Old 02-03-2009, 07:27 PM
Amily95 Amily95 is offline
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Default Re: Need help figuring out what type of generator this is

thanks man i just dont whant to do any damege to the gen when i go to start it because some stupid backwards wire
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Old 02-05-2009, 08:40 PM
Amily95 Amily95 is offline
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Default Re: Need help figuring out what type of generator this is

ok do i need to supply 12volt + to a1 and a2 (the big white braided wires going to the gen) 12volt - to the s1 (stater im guessing) to turn the gent to start the motor or is it vise versa
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Old 02-06-2009, 06:24 PM
Amily95 Amily95 is offline
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Default Re: Need help figuring out what type of generator this is

ok i finally got it to spin the gen put pos on s1 and neg on a1 the starter button apparently is bad so im going to re wire a new one for a car to replace it .

the next issue is ther is gas coming from a hole on the left side of the throttle linkage every time the motor turns is this a sighn of a bad carb. it never fired but did have spark (dam did it ever . my hand sliped and touched the spark plug ) but i don't thing the carb should be spitting gas out of any hole .
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Old 02-06-2009, 08:12 PM
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Default Re: Need help figuring out what type of generator this is

They make a spark plug tester. Lot less painful. My best is checking the exhaust pipe on a BFA with my arm. Instant BBQ. You may have some trash under the needle of the carb.
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Old 02-06-2009, 08:21 PM
Amily95 Amily95 is offline
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Default Re: Need help figuring out what type of generator this is

thanks didn't think to check . the rest of the gas system was all filled with trash so i don't know why i didn't think to pull the carb . and yea ive done old arm trick with my big 15k unit . i was degrease ing it and doing basic maint. and had it running to heat up the oil for a change and slipped and forearm hit on the exast pipe dam that burned like hell but oh well its one of the haz. of working on your own units
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