JoeH Posted September 4, 2024 Share Posted September 4, 2024 Have you put a test light to the wires on the headlight plugs? It is possible both highbeam filaments have failed. Just trying to think simplest/cheapest. Quote Link to comment https://www.bigmacktrucks.com/topic/74492-r-model-electrical-help/page/3/#findComment-558057 Share on other sites More sharing options...
Joey Mack Posted September 4, 2024 Share Posted September 4, 2024 JoeH is right. Also, un plug the dash light dimmer switch and try it again. Those switches can cause issues. Quote Link to comment https://www.bigmacktrucks.com/topic/74492-r-model-electrical-help/page/3/#findComment-558059 Share on other sites More sharing options...
Supahonky Posted September 4, 2024 Author Share Posted September 4, 2024 Yeah I ordered the book but it takes a couple of weeks to come in. I’m trying to get my truck to pass safety right now so I can use it. So far I’ve only see one relay from the factory and both in g aftermarket on the truck. Quote Link to comment https://www.bigmacktrucks.com/topic/74492-r-model-electrical-help/page/3/#findComment-558062 Share on other sites More sharing options...
KP2 Posted 5 hours ago Share Posted 5 hours ago Supahonky, did the book you ordered help out? I just bought a 1992 RD688s and am pulling what’s left of my hair out trying to figure the wiring out. Quote Link to comment https://www.bigmacktrucks.com/topic/74492-r-model-electrical-help/page/3/#findComment-587703 Share on other sites More sharing options...
mowerman Posted 5 hours ago Share Posted 5 hours ago I wouldn’t expect much response at this hour most everybody on here is asleep ha ha ha good luck I am not sure if you’ve ever followed a wiring schematic, but they are very difficult even if you get them right in front of you good luck.. bob 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74492-r-model-electrical-help/page/3/#findComment-587704 Share on other sites More sharing options...
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