cruiseliner64 Posted February 15 Share Posted February 15 That is just flat out beautiful.Great progress..love the shop too.... Paul 2 Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/12/#findComment-591278 Share on other sites More sharing options...
Popular Post mrsmackpaul Posted February 15 Popular Post Share Posted February 15 Now that's a mile stone, good job Paul 4 Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/12/#findComment-591284 Share on other sites More sharing options...
hicrop10 Posted Thursday at 08:19 PM Author Share Posted Thursday at 08:19 PM I’m wiring up the truck now. Using 2 12 volt batteries,not 4 6 volts ones.Here’s the diagram I’m using,is this correct?I am pretty sure the truck is positive ground.Anything I should be doing since it has been about 15 years since I last wired up a Mack. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/12/#findComment-592430 Share on other sites More sharing options...
mechohaulic Posted Thursday at 09:20 PM Share Posted Thursday at 09:20 PM that diagram should do you just fine since only change you are making is the 2 -12's VS 4-6's. difference in dia with 4 -6's would have two 6 volt batteries tied in series on each side. 6's in series = a strong 12 also give a longer lasting cranking power. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/12/#findComment-592433 Share on other sites More sharing options...
mowerman Posted Thursday at 09:24 PM Share Posted Thursday at 09:24 PM great progress,,,,,clearly,i missed a few updates,,,bob Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/12/#findComment-592434 Share on other sites More sharing options...
hicrop10 Posted Thursday at 10:55 PM Author Share Posted Thursday at 10:55 PM 1 hour ago, mechohaulic said: that diagram should do you just fine since only change you are making is the 2 -12's VS 4-6's. difference in dia with 4 -6's would have two 6 volt batteries tied in series on each side. 6's in series = a strong 12 also give a longer lasting cranking power. Tks,it has been about 15 or more since I last did this.Just don’t want to burn anything up 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/12/#findComment-592436 Share on other sites More sharing options...
mowerman Posted Thursday at 11:03 PM Share Posted Thursday at 11:03 PM hell its been 40 years for me,,lol.bob 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/12/#findComment-592437 Share on other sites More sharing options...
67RModel Posted Thursday at 11:57 PM Share Posted Thursday at 11:57 PM My 67 R model is positive ground yet so I would think an older B model would be positive ground too 2 Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/12/#findComment-592439 Share on other sites More sharing options...
mrsmackpaul Posted Friday at 07:57 AM Share Posted Friday at 07:57 AM Series parallel is pretty simple, more confronting to look at than it actually is Follow the diagram and you'll be fine Paul 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/12/#findComment-592451 Share on other sites More sharing options...
hicrop10 Posted 1 hour ago Author Share Posted 1 hour ago On 3/6/2026 at 2:57 AM, mrsmackpaul said: Series parallel is pretty simple, more confronting to look at than it actually is Follow the diagram and you'll be fine Paul Finally figured out that my sps is bad got 24 going in and nothing coming out.So I went on line and found one.So now I wait for my oil filter( hopefully Friday),sps also thinking Friday.Will be busy this weekend if all goes well. Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/12/#findComment-592715 Share on other sites More sharing options...
tjc transport Posted 1 hour ago Share Posted 1 hour ago we never bothered replacing SPS in trucks when they went bad, just converted the truck to 12 volt. 1 Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/12/#findComment-592716 Share on other sites More sharing options...
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