I'll check next week about the batteries, I can't see any reason why they would have any effect on the switch boxes. It could load up the stator's charging circut if you have the high output stator as AGMs and Gel Cell batteries are not designed to handle high amperage or high finishing voltage charging systems. The rare few times I've installed AGMs or gels( i usually talk people out of installing them), I've had to change out the onboard chargers(or change the switch on the back if they have one), and turn the altenators down if they have an adjustable regulator. I will not honor the warranty for labor if I install an AGM or Gel on a customers boat, and I tell them this up front. I know there are a lot of people out there that swear by them, but I can't find a reason to justify their cost, and the reduced capacity of the electrical system if its properlly set up. I put them in the same catagory as split fire spark plugs, I could never figure out why some one would spend $100 on a set of plugs thinking that would fix their boat, but wouldn't pay a profesional mechanic to actually find the problem. I've seen plenty of people that would put $300 worth of batteries in their boat, buut would pay me $100 to replace the crappy battery cables they hooked them up to
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