Countrylife Posted July 10, 2020 Share Posted July 10, 2020 Hi All, I am hoping someone has an idea here as I am a bit confused. At some time someone cut the batteries off the truck (4 6volts) and I am adding 2 12v. Here is a diagram of how it is currently wired. I know this is wrong because there are currently 3 neg terminal ends and one positive that goes straight to the starter. I have looked that how other trucks are wired and also looked up a few diagrams but that seem to have different answers to each. First the Owner swears this is a negative ground but I am not so sure. What does appear to be happening is they look to have set it up on 12v and were using jumper cables when starting. If anyone has some clarity I would be appreciative. I think it is supposed to be f1 - 2+ f2 - 1+ f3 - ST2 f4 - 2- ST1 - 1- But I am not certain as the diagrams conflict. What I am certain of is that when we hook it as it is, it tries to melt the last battery terminal we hook up. I get how series parallel works. with one set connected neg to pos and the left over positive going to the truck and left over neg going to ground giving 24v What I am not certain is how the switch is making the connection. It would seem to me it makes it across f1 to f3 but I need to learn a bit more apparently cause I am not certain on this. When I run 12v from a hot to the small post on the rear drivers side of the switch I get a "click" but that does not mean the switch has not failed and hence the goofy readings we get on the OHM meter. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/63245-need-help-on-a-59-b-1224-parallel-series-switch/ Share on other sites More sharing options...
j hancock Posted July 10, 2020 Share Posted July 10, 2020 More diagrams in link to ponder. https://www.bigmacktrucks.com/tutorials/article/70-wiring-schematic-for-series-parallel-switch/ Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/63245-need-help-on-a-59-b-1224-parallel-series-switch/#findComment-455492 Share on other sites More sharing options...
terry Posted July 10, 2020 Share Posted July 10, 2020 Looks like he has the second one in the photos, terry Quote Link to comment https://www.bigmacktrucks.com/topic/63245-need-help-on-a-59-b-1224-parallel-series-switch/#findComment-455541 Share on other sites More sharing options...
mrsmackpaul Posted July 10, 2020 Share Posted July 10, 2020 When you hook the batteries up does the amp gauge show whether its charging or discharging If it shows its charging and the motor isnt running it would mean the polarity is back to front and if you have it hooked up for negitve ground its postive ground Paul Quote Link to comment https://www.bigmacktrucks.com/topic/63245-need-help-on-a-59-b-1224-parallel-series-switch/#findComment-455546 Share on other sites More sharing options...
fuzzy buzzard Posted July 11, 2020 Share Posted July 11, 2020 Look at the B Model Registry on this site. There is a ton of info there including diagrams for SPS that are positive or negative ground. Quote Link to comment https://www.bigmacktrucks.com/topic/63245-need-help-on-a-59-b-1224-parallel-series-switch/#findComment-455550 Share on other sites More sharing options...
phildirt Posted July 11, 2020 Share Posted July 11, 2020 This may be what you have already seen. The old voltage regulators were either negative or positive ground, but the more modern ones can be used with either. If your series/ parallel switch has through bolts open it up and repair the burnt contacts. There are two sets of contacts within the S/ P switch. Quote Link to comment https://www.bigmacktrucks.com/topic/63245-need-help-on-a-59-b-1224-parallel-series-switch/#findComment-455552 Share on other sites More sharing options...
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