Run the car at higher revs for about one minute before attempting to start the bus/truck. What is happening in fact is that you are charging the one 12 Volt bus battery which in turn is sharing the charge with the other bus battery at 12 Volt.
You may hear the revs on the car drop as the alternator starts to charge the truck/bus batteries.
Note: Double check that the jumper cables are hooked to the same battery of the 24V system!! Now, hook the – (Negative/Earth/Black) jumper cable to the – (negative) terminal marked “B” in the diagram. Now, hook the – (Negative/Earth/Black) jumper cable to the Earth terminal (-/Negative) of the 12V car battery. Make sure that it does not touch anything else. Hook the + ( positive/ red) jumper cable to the Red (+) terminal of the 12V car battery and to the terminal on the 24 Volt system. If this is the same way your 24 Volt system is connected, the starting procedure is quite simple. The battery system is connected as in this diagram which is the most common setup for 24 Volt systems in trucks and buses:
24 VOLT MACK TRUCK STARTER SERIES
It consists of 2 x 1000 CCA 12 Volt batteries connected in Series to give 24 Volts. The motorhome has a 24 Volt starting battery configuration. As most know by now, I live in a motorhome (Bus). I will only speak about first hand experience in this post. Which 24 Volt systems can be jumped from a 12 Volt system? There are a few things to keep in mind and a few mistakes that can cost you big time, so, read carefully and make double sure you have the connections correct! Disclaimer: Everyone trying this method according to this post, do so at their own risk. Today we look at jump starting a 24 Volt system using a 12 Volt ordinary vehicle. Jump Start a 24 Volt truck from your 12 Volt car
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