This may be a stupid question but I'm going to ask anyway. We have bill acceptors in the bays, newest Coinco VL-1213-3E and one of them doesn't work. We took it out and had it cleaned and it worked for a day. I'd like to replace it with a Mars but not sure which one to purchase. We need a spare anyway. The Coinco is 24v, will I have to change the harness? Thanks in advance.