JeffNichols Posted August 28, 2011 Share Posted August 28, 2011 Just bought a 66 B75 dumptruck. It has 2 battery boxes and no cables or batteries. Trying to figure out if this model uses a series parallel switch or ? It has one lead off the starter that appeared to head forwards. Any help would be appreciated. You can always call me if you want 253-592-2378Jeff Quote Link to comment https://www.bigmacktrucks.com/topic/20350-1966-b75/ Share on other sites More sharing options...
vanscottbuilders Posted August 29, 2011 Share Posted August 29, 2011 If there is a series parallel switch, it should be easy to spot. Likely between the seats in a small steel box,or ahead of the firewall and down low, on either side of the truck. (The B-73 and 75 trucks had several originalmounting locations)But - it might be a good time to convert the starter to 12 volt, and skip the 24v starting system all together,especially if you don't have batteries or cables anyway.You will never regret it. Series parallel switching is an added maintenance item, not necessary with the batteryand starter technology available today.Two good 12v batteries will do the job nicely, rather than the original four six volt units.Good Luck! Nice choice of trucks!Paul Van Scott Quote Link to comment https://www.bigmacktrucks.com/topic/20350-1966-b75/#findComment-84569 Share on other sites More sharing options...
Rob Posted August 29, 2011 Share Posted August 29, 2011 Paul is very correct in this analogy. Replace the existing starter with a Delco 42MT series, install new 2/0, (or larger) copper welding cable for leads, connect the positive lead to the large center terminal of the solenoid, and the negative lead to a starter mounting bolt, run a "trigger wire" from your starter button in the dash to the "S" terminal on the starter mounted solenoid, and you should basically be set. If the truck currently has a generator installed on the engine it is probably a positive ground system. In this case, run the negative lead to the center terminal of the solenoid, and ground the positive lead. Now however would be a great time to swap to an alternator and change the ground polarity to negative ground which is much more common nowadays. If you plan to run the existing dash mounted ammeter, swap the leads on the rear of the gauge if you change polarity. A good set of group "30", or "31" series batteries and that motor will spin rapidly. The starter motor doesn't care which polarity it has and will only spin one way.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/20350-1966-b75/#findComment-84572 Share on other sites More sharing options...
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