Deere Mack Posted March 7, 2014 Share Posted March 7, 2014 Excuse my ignorance, but do all the clearance lamps on top of the cab light up with switch on. And the park lamps are just the side marker lights and tail lights? When not much is lighting up its hard to tell. Quote Link to comment Share on other sites More sharing options...
GreenGiant2 Posted March 7, 2014 Share Posted March 7, 2014 cl lmps are the two out side ones and the 3 cluster come on with the hd lite switch Quote We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. Link to comment Share on other sites More sharing options...
Deere Mack Posted March 7, 2014 Author Share Posted March 7, 2014 cl lmps are the two out side ones and the 3 cluster come on with the hd lite switchSo with the switch on PARK LPS I should have the middle top three on cab along with side marker lights and tail lamps? And of course all mentioned with swithc to LIGHTS? CL LPS are cab top two outside lights only. Quote Link to comment Share on other sites More sharing options...
ws721 Posted March 7, 2014 Share Posted March 7, 2014 Think of CL LPS as your trailer light switch, that has the 2 outside cab lights hooked to it. The "flash to pass" switch up by the door post is hooked to that circuit. Quote Remember if it's got a hood it's no good! Link to comment Share on other sites More sharing options...
ws721 Posted March 7, 2014 Share Posted March 7, 2014 Yes you are correct, When the switch is in the Headlight or Park position then 3 center side markers on hood and tail lights should be on Quote Remember if it's got a hood it's no good! Link to comment Share on other sites More sharing options...
Deere Mack Posted March 7, 2014 Author Share Posted March 7, 2014 Thanks a million! I've already bought a couple new switches that are bad, but looks like I'm going to have to re-do some half arse patch jobs to the wiring too. Got plenty of solder and heat shrink left over from rewiring my lowboy not to long ago. I can't stand having electrical problems due to patch jobs. Honestly, I cant stand anything not to work like it should. Anyone got a wire diagram for 1979 RD685S, just in case? Quote Link to comment Share on other sites More sharing options...
j hancock Posted March 7, 2014 Share Posted March 7, 2014 This will get you started. A little newer but the basic stuff is the same.http://www.bigmacktrucks.com/index.php?/tutorials/article/55-r-model-wiring-diagram/ 1 Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
Deere Mack Posted March 7, 2014 Author Share Posted March 7, 2014 This will get you started. A little newer but the basic stuff is the same.http://www.bigmacktrucks.com/index.php?/tutorials/article/55-r-model-wiring-diagram/Thanks again! Think I'll take that to office depot and have it printed on large paper and hang it on the garage wall. Quote Link to comment Share on other sites More sharing options...
j_martell Posted March 7, 2014 Share Posted March 7, 2014 Ahhhh wiring, let the hair pulling begin lol 1 Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment Share on other sites More sharing options...
leversole Posted March 7, 2014 Share Posted March 7, 2014 On my Superliner, I thought I had headlight and clearance lamp switch problems...all of these lights go thru the courtesy switch on the dash (if you have it), mine was just dirty, flipping it back and forth several time solved the problem! Quote Link to comment Share on other sites More sharing options...
Deere Mack Posted March 12, 2014 Author Share Posted March 12, 2014 This will get you started. A little newer but the basic stuff is the same.http://www.bigmacktrucks.com/index.php?/tutorials/article/55-r-model-wiring-diagram/FYI: To any future electrical problem solvers. This download does give insight to the basic schematics of the electrical system, but things such as the electrical block panels or junction panel descriptions do not match up to my 1979 RD. The page is dated 1983, so I guess things changed. None the less, I got it figured out. Quote Link to comment Share on other sites More sharing options...
Deere Mack Posted March 12, 2014 Author Share Posted March 12, 2014 On my Superliner, I thought I had headlight and clearance lamp switch problems...all of these lights go thru the courtesy switch on the dash (if you have it), mine was just dirty, flipping it back and forth several time solved the problem!The majority of my problems came from a bad rheostat for dash lights, bad 3 position light switch, shorted out wiring and poor patch jobs under the hood. Replaced the switches and rebuilt the wiring from firewall out and all seems well! Luckly all the wiring in the dash is still in very good original condition. Quote Link to comment Share on other sites More sharing options...
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