2 STICK PUPPY Posted May 26, 2014 Share Posted May 26, 2014 Can anyone tell me how to convert my 69 R -685T to negative ground? I keep getting different answers from mechanics I know. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/35872-convert-to-negative-ground/ Share on other sites More sharing options...
j hancock Posted May 26, 2014 Share Posted May 26, 2014 Doing a search in the electrical forum will get you more info.Here is onehttp://www.bigmacktrucks.com/index.php?/topic/3004-positive-to-negative-ground-conversion/?hl=%2Bconversion+%2BnegativeI have a couple positive ground trucks and a couple negative ground and if properly maintained, both systems work equally well. 1 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/35872-convert-to-negative-ground/#findComment-246988 Share on other sites More sharing options...
2 STICK PUPPY Posted May 26, 2014 Author Share Posted May 26, 2014 Thanks. .. I did a search and found that post. .. I'm getting conflicting information. .. change gauge, switch wires on the buss bars and so on ... I did this conversation many years ago on the 71 DM in the picture you see in my signature. I only remember changing the alt. And the amp and temp gauge but I think I can just reverse the wires on the gauge Quote Link to comment https://www.bigmacktrucks.com/topic/35872-convert-to-negative-ground/#findComment-246991 Share on other sites More sharing options...
41chevy Posted May 26, 2014 Share Posted May 26, 2014 Change Alternator, reverse wires on Amp and Temp Gauge and Batteries Not sure about the fuel gauge. If you have a radio or CB they have to be changed. Some have a dip switch to change ground from plus to negative. Paul Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/35872-convert-to-negative-ground/#findComment-246992 Share on other sites More sharing options...
2 STICK PUPPY Posted May 26, 2014 Author Share Posted May 26, 2014 Thanks that's what I remember doing but it's been since the 80 ' s ... no cb yet it has a radio with a converter but the converter blew ... only reason I want to go negative ground is I'm putting ac satellite radio and other creature comforts Quote Link to comment https://www.bigmacktrucks.com/topic/35872-convert-to-negative-ground/#findComment-246994 Share on other sites More sharing options...
HarryS Posted May 26, 2014 Share Posted May 26, 2014 When I changed my B over I did the same as mentioned but also had to change the fuel gauge and sending unit. I got the units from Summit Racing for just a little over $100. The one thing to be careful of is to match the gauge and sending unit OHM ratings. No problems since conversion. Quote Link to comment https://www.bigmacktrucks.com/topic/35872-convert-to-negative-ground/#findComment-247033 Share on other sites More sharing options...
2 STICK PUPPY Posted May 27, 2014 Author Share Posted May 27, 2014 I was told to just reverse the wires on the gauges Quote Link to comment https://www.bigmacktrucks.com/topic/35872-convert-to-negative-ground/#findComment-247073 Share on other sites More sharing options...
41chevy Posted May 27, 2014 Share Posted May 27, 2014 I was told to just reverse the wires on the gaugesThat is all you need to do for the fuel gauge(s) Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/35872-convert-to-negative-ground/#findComment-247100 Share on other sites More sharing options...
2 STICK PUPPY Posted May 27, 2014 Author Share Posted May 27, 2014 Thanks. .. I slightly remember that all of this not being a major job Quote Link to comment https://www.bigmacktrucks.com/topic/35872-convert-to-negative-ground/#findComment-247101 Share on other sites More sharing options...
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