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 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 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 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 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 Share on other sites More sharing options...
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