TownsendMack Posted November 10 Share Posted November 10 Looking for a wiring schematic on a 1986 RL688LST dumptruck. The wiki link/sticky seems to be dead. A pdf would be much appreciated, if anyone has copies, as I've been sorting through electrical gremlins wire by wire on lighting for a friend. Also, saw this the other day...looking to track down why this solenoid does not have a trigger...? seems to be more of a terminal junction now... Driverside engine bay, inboard of supply terminals. What was original intent for this relay? Quote Link to comment https://www.bigmacktrucks.com/topic/74732-1986-r-series-wiring-schematics/ Share on other sites More sharing options...
Joey Mack Posted November 11 Share Posted November 11 it looks like it is being used as an accessory relay.. there should be one in the cab under the ash tray too.. I wish I could help with a schematic. all I have is some old notes from some RW's I worked on. looks lie a lot of added wires as well as dissabled wires too.. I assume you are wanting to clean it up.. Quote Link to comment https://www.bigmacktrucks.com/topic/74732-1986-r-series-wiring-schematics/#findComment-561693 Share on other sites More sharing options...
TownsendMack Posted November 11 Author Share Posted November 11 Thanks for the response. Yes, alot of added and disabled wires...lots of hands messing about. I would like to clean up for some reliability, but was hoping to atleast have the advantage of the terminal designations under the drivers side hood. I guess most likely a drawing would not help much with all the "patches" that have appeared to have been done over its life. Quote Link to comment https://www.bigmacktrucks.com/topic/74732-1986-r-series-wiring-schematics/#findComment-561702 Share on other sites More sharing options...
Joey Mack Posted November 11 Share Posted November 11 Yeah, i'm sorry bud.. I wont do much good on this one... Quote Link to comment https://www.bigmacktrucks.com/topic/74732-1986-r-series-wiring-schematics/#findComment-561707 Share on other sites More sharing options...
terry Posted November 11 Share Posted November 11 Would that relay on the firewall engage the big solenoid on starter? terry Quote Link to comment https://www.bigmacktrucks.com/topic/74732-1986-r-series-wiring-schematics/#findComment-561710 Share on other sites More sharing options...
TownsendMack Posted November 11 Author Share Posted November 11 No worries, I'll have to trace it out. I was hoping someone might know off the top of their head. Whatever it was for, there is not a trigger to fire the relay coil..it may be shorted, and not important anymore since most of the feeds are bypassed on the one post. It'll just take time to track probelm wires and circuits with the fluke and power probe as they arise. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74732-1986-r-series-wiring-schematics/#findComment-561722 Share on other sites More sharing options...
mowerman Posted November 11 Share Posted November 11 i might have something in my garage,,,,bob Quote Link to comment https://www.bigmacktrucks.com/topic/74732-1986-r-series-wiring-schematics/#findComment-561756 Share on other sites More sharing options...
mowerman Posted November 12 Share Posted November 12 Quote Link to comment https://www.bigmacktrucks.com/topic/74732-1986-r-series-wiring-schematics/#findComment-561759 Share on other sites More sharing options...
mowerman Posted November 12 Share Posted November 12 they are very confusing,,,this might help Quote Link to comment https://www.bigmacktrucks.com/topic/74732-1986-r-series-wiring-schematics/#findComment-561760 Share on other sites More sharing options...
mowerman Posted November 12 Share Posted November 12 and yes,,,i see its too hard to read sorry Quote Link to comment https://www.bigmacktrucks.com/topic/74732-1986-r-series-wiring-schematics/#findComment-561761 Share on other sites More sharing options...
TownsendMack Posted November 12 Author Share Posted November 12 Greatly appreciated! Traced a ground that was popping headlight fuse...removed wire assuming it was trailer lighting related , and then engine failed to start and not even turn over...bandaides on bandaids to sort out with all the scabbed wires. Quote Link to comment https://www.bigmacktrucks.com/topic/74732-1986-r-series-wiring-schematics/#findComment-561768 Share on other sites More sharing options...
mowerman Posted November 12 Share Posted November 12 ha ha well hope you get it figured out wiring is very confusing. I was hoping to get photographs from the manual Wire layouts are really hard to follow…. Bob Quote Link to comment https://www.bigmacktrucks.com/topic/74732-1986-r-series-wiring-schematics/#findComment-561781 Share on other sites More sharing options...
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