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Gary,
The Guest is a high tech 3 stage charger, so it won't cook the batteries when fully charged. It will go into a float charge mode.
The guest charger as shown should have 2 sets of wires to charge two 12v batteries at one time. Or one 24v set.
Simply take one pos and one neg from each set, cut and wire nut together.
Your 4 chassis (start) batteries will be interconnected with wires in some fashion to produce 24v. You need to find the final positive and the final negative (ground) of the set.
Take the Guest positive from one set and secure to the final positive on your battery set. Do the same with the negative. You can always put a meter on both sets on the battery to make sure you're dealing with 24v.
Good luck.
Mike
Note: From personal experience I can tell you that if a cell in a battery goes dead, sometimes the guest charger will not go to float and will continue trying to charge up that battery in the bank. With that you will notice a very strong sulfur smell in the bus barn, and you'll be forced to change the batteriesl
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