burnin oil Posted October 11, 2011 Share Posted October 11, 2011 Does anyone have a wiring schematic for a series parrallel switch truck for the old setup with seperate switch and relay? The ones in the Wiki are all the newer style switch that I am going to but I have a few extra wires to identify. My original setup in the L model had the relay, switch, and 2 fuses next to the switch/relay between the seats if that helps. I already ID'd the battery cables (obvious), start switch lead, and power lead for the cab but have no idea what the rest is. I assume one is the charge from the generator/regulator. I am stuck upgrading the system due to the relay dying and not being rebuildable anymore. Please no banter about converting the starter to 12v. I want to keep the system 12/24v. Quote Link to comment https://www.bigmacktrucks.com/topic/20999-wiring-schematic-for-series-parallel-switch/ Share on other sites More sharing options...
dover Posted October 14, 2011 Share Posted October 14, 2011 I think I have what you are after. Give me a few to dig it up and scan it.Ben Quote 1962 B733 L cab Link to comment https://www.bigmacktrucks.com/topic/20999-wiring-schematic-for-series-parallel-switch/#findComment-88431 Share on other sites More sharing options...
dover Posted October 14, 2011 Share Posted October 14, 2011 Is this the diagram you are after?Ben Quote 1962 B733 L cab Link to comment https://www.bigmacktrucks.com/topic/20999-wiring-schematic-for-series-parallel-switch/#findComment-88432 Share on other sites More sharing options...
Barry Posted October 14, 2011 Share Posted October 14, 2011 Added to the BMT Wiki! Quote Barry - Watt's Truck Center Parts Manager and BMT Webmaster...1-888-304-MACK Link to comment https://www.bigmacktrucks.com/topic/20999-wiring-schematic-for-series-parallel-switch/#findComment-88440 Share on other sites More sharing options...
burnin oil Posted October 15, 2011 Author Share Posted October 15, 2011 Thanks Dover but not exactly. That is a basic how to wire the switch but I am trying to figure what the truck has coming to the switch. It had a few more wires than that to contend with. So far I have 4 battery cables, start, ground, power feed through the amp meter for the cab acc and still have a couple of extras left over coming out of the harness. I am guessing that one is a wire from the generator but there is still 2 more that I haven't accounted for yet. This is after getting rid of the extras that go from the relay to the SP. It also appears that the ground is running through a fuse holder also and I still have another fuse holder next to that. Someone on another site posted up a schematic for a later mack but still isn't right to what I have. Its close but It may be what I have to work with it. Quote Link to comment https://www.bigmacktrucks.com/topic/20999-wiring-schematic-for-series-parallel-switch/#findComment-88472 Share on other sites More sharing options...
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