B733 Posted August 30, 2018 Share Posted August 30, 2018 need help with wiring diagram. need diagram for 1957 b73, or somewhere about there, 12 volt positive ground, 24 volt starter, Cummins powered, with circuit breakers instead of fuses. got most of harness built need diagram to finish new harness, old harness copied as far as i could. had trucker/electrician make mods to it over years. engine going back in frame now, chrome sent out, cab ready to paint. Quote Link to comment https://www.bigmacktrucks.com/topic/54158-b73-wiring/ Share on other sites More sharing options...
j hancock Posted August 31, 2018 Share Posted August 31, 2018 Here is a link to a B61 harness that will give you some info. Click the pdf. Trucks were pretty basic and the wiring was similar between the two models. https://www.bigmacktrucks.com/tutorials/article/4-b-model-wiring-diagram/ Series parallel switch info for pos and negative ground. https://www.bigmacktrucks.com/tutorials/article/70-wiring-schematic-for-series-parallel-switch/ Post some pics of your project when you get a chance. Everyone likes pics! 1 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/54158-b73-wiring/#findComment-405233 Share on other sites More sharing options...
h67st Posted August 31, 2018 Share Posted August 31, 2018 18 hours ago, B733 said: need help with wiring diagram. need diagram for 1957 b73, or somewhere about there, 12 volt positive ground, 24 volt starter, Cummins powered, with circuit breakers instead of fuses. got most of harness built need diagram to finish new harness, old harness copied as far as i could. had trucker/electrician make mods to it over years. engine going back in frame now, chrome sent out, cab ready to paint. I've seen a lot of mods made to truck wiring over the years...it's usually more of a trucker than an electrician that cuts into them! Quote Link to comment https://www.bigmacktrucks.com/topic/54158-b73-wiring/#findComment-405238 Share on other sites More sharing options...
b422 Posted September 8, 2018 Share Posted September 8, 2018 On 8/31/2018 at 8:49 AM, j hancock said: Here is a link to a B61 harness that will give you some info. Click the pdf. Trucks were pretty basic and the wiring was similar between the two models. https://www.bigmacktrucks.com/tutorials/article/4-b-model-wiring-diagram/ Series parallel switch info for pos and negative ground. https://www.bigmacktrucks.com/tutorials/article/70-wiring-schematic-for-series-parallel-switch/ Post some pics of your project when you get a chance. Everyone likes pics! Do these apply to a B422? The main thing I'm looking for is what batteries do I need to put in the truck. Do I need 2 or 4? Quote Link to comment https://www.bigmacktrucks.com/topic/54158-b73-wiring/#findComment-405686 Share on other sites More sharing options...
41chevy Posted September 8, 2018 Share Posted September 8, 2018 The original system for the gas engine running a twelve volt system ran a pair of 6VOLT Batteries in Series to get twelve volts.With modern battery technology you could run a single 12 volt battery or a pair of 6 volts in series to look factory. 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/54158-b73-wiring/#findComment-405694 Share on other sites More sharing options...
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