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Wiring schematics for a Kenworth W900b

Posted By Trenton 5 Years Ago
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Trenton
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To All,
Thanks for the help, advice  and the schematics. I think I have two batteries that are going/gone bad that need to be dealt with as well. I guess now I need to get to work.
Thanks again,
Trenton
Tony Bullard
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I think this drawing and attachment are ones I stole from Kid.
Your circuit breaker on the left is the main load breaker. The middle one which isn't shown in these drawings protects the starter control wiring in the event the large starter contacts don't make when the starter is energized. All the starter load would have to pass through those smaller wires if that happened.   Your starter solenoid has two coils, a pull in and a holding winding. These drawings only show the pull in which is independent of the starter winding and that is why there is no breaker.
http://forums.justoldtrucks.com/uploads/images/616de8e1-8efe-43cd-ad2e-d6e8.jpg
The attached file is the whole wiring.



Tony
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KW 12 start 12 run.jpg (30 views, 95.00 KB)
KW wiring 70s.pdf (37 views, 829.00 KB)
Kid
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Trent, the 2 on the left (round) are old style thermal wafer circuit breakers. The 2 wafers in each, warp away from contacting when they get too hot.
The other is a relay.Search and look thru my old posts, search wiring and kid, or schematics and kid. There is a 12v start/run version in there, and the early B models are the same wiring numbers.
Tony Bullard
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I think Trenton's is straight 12 volt start and run. I'll post some stuff that may help tomorrow.


Tony
roKWiz
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Trenton,
I'm hoping someone with a bit more knowledge than me chimes in but they look like what you stated.

Whether you have 2, 3 or even 4 12volt batteries wired in parallel, its still a 12 volt bank of batteries.
The wiring dia. ( I posted earlier) uses 4 6volt batteries two sets of two wired in series effectively giving 2  12 volt batteries.
Your set up of 3 maybe to give more cold cranking amps.??

If your KW is 24volt start 12volt run, ?? there should be a series parallel switch close by the battery box which looks similar to these in attached PDF.
There has been a few discussion here before on Kenworth charging / starting systems, try and search back through the threads if no one else can help.
Geoff

http://forums.justoldtrucks.com/uploads/images/6b80ef17-fdf2-4884-bd90-1831.jpg


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bosch SP switch.pdf (10 views, 285.00 KB)
Trenton
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Below is a picture of the component(s) that I believe to be bad. None of three components are like any I have seen before. I assume the one on the right is a relay and the two on the left are simply distribution blocks. Can anyone tell me what
they are and their function?
http://forums.justoldtrucks.com/uploads/images/78b4f9c7-807f-47dc-a452-e5f1.jpghttp://forums.justoldtrucks.com/uploads/images/a6c5c6ba-a88d-4672-8878-6eff.jpg

Thanks,
Trenton










Trenton
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Tony and Rokwiz,
My truck has three 12v batteries wired in parallel and I am unsure of what the issue is. I will try to get pictures of the component that I believe to be bad will post them soon.

Thanks
Trenton
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Trenton,
Are you having problems with the series parallel system 24v start 12v run.?

http://forums.justoldtrucks.com/uploads/images/edcf5564-e400-43d7-b00f-cf9d.jpg


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W900 wiring diagram colour.jpg (28 views, 1.00 MB)
Tony Bullard
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I have PDFs of them for W900 printed in '82. I don't know if that would be good for '84 also W900b.

EDIT: Actually it says on the cover page "K100, C500, W900 Built Before March 1, 1982". I guess that won't help. Sorry


Tony
Trenton
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I just purchased a 1984 Kenworth W900b and am in need of a wiring diagram. There is an issue with the starter relay and the charging system that need to worked out. Anybody have a hard copy or an electronic file they would be willing share?

Thanks,
Trenton


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