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Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system.

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  #1  
Old 10-17-2008
bankersbird bankersbird is offline
bankersbird
 
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Default schematics?

Hello,

Does anyone have a set of schematics that shows the retarder circuitry? My 1984 1/2 pt does not have any documents showing this information.

Thanks in advance, Claude
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  #2  
Old 10-17-2008
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Randy Dupree Randy Dupree is offline
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is this a tranny retarder or an engine jake brake?
just to be sure i'm on the same page as you!
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2000 LXI 43
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  #3  
Old 10-17-2008
bankersbird bankersbird is offline
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It's a tranny retarder for an Allison MTB 654CR.
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1984 1/2 PT 36
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  #4  
Old 10-17-2008
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John Wyatt – Administrator/Moderator
 
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After talking with Claude about this via email it appears to me that the problem is that when his ignition switch is in the “on” position not everything that depends on the ignition switch being “on” is getting power.

He has discovered that his rear view monitor and head light buzzer are also acting up at the same time that the Retarder fails to work. When the rear view monitor is working the Retarder is ok.

I think he needs to know if there is anything besides the ignition switch (such as a relay) that distributes the ignition “on” signal to things like the Retarder circuit and the rear view monitor/camera.

Thanks,
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1991 40' WLWB-WTB
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1991 40' WB ...From 2008 - Present
1984 ½ PT-36 .From 2000 - 2008
1973 FC-31 .....From 1991 - 2001
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  #5  
Old 10-17-2008
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Randy Dupree Randy Dupree is offline
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the older birds did have a problem with over loading the ignition switch.
so,its possible its bad.
but,the symtoms all point to a bad ground,since so many things are affected.
but,if the ignition switch is bad,it could cause the same problems.
so,heres what i would do,i would replace the ignition switch,and check all the grounds at the same time.
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  #6  
Old 10-18-2008
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I would highly recommend that you modify the ignition switch, A/C fans, defrosters etc with bosch relays to get all of the high current users out of the dash and shift console. Will stop a lot of these problems. By the way in your PT the cruise control and retarder are interdependent. Did you check for power at the bosch relay in the engine compartment?
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  #7  
Old 10-27-2008
bankersbird bankersbird is offline
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Thanks to all for the replies.

We're still on the road and will dig into problem in two weeks. The retarder is currently working, but goes in an out, sometimes it does and sometimes it doesn't, same for the monitor.

I have also noticed more recently that the engine doesn't want to start (doesn't turn over) after driving, shutting down and restarting. If I hold the ignition in the on position long enough it will finally turn the engine over. It appears the ignition switch as others are saying could be the culprit.
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