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Thanks for the suggestion and I will look in to that as I move along with putting this electrical system back together correctly.

Thanks for the in-depth response and I wish I had the time to do all of that right now but my HOA doesn’t like the boat in the driveway. I wired the batteries as shown in the diagram and will only use bat 2 as a house battery as you suggest. I requested the original build for my boat from...

So I answered my own question about the isolator but what I don’t know is why they would have ran the bat 1 cable on the common post? Was it just a mistake or another reason because bat 2 was just along for the ride and not used for anything.

Ok, so I’m an idiot for connecting the cables like the previous owner. They had the bat 1 cable on the common and vise versa. Now that I’ve got that squared away is the red box the isolator and can I put a bat 2 cable on it over the bat 1 cable? Right now there is only a bat 1 cable attached and...

Yes, all fuses have been checked and are all good. I may try to run battery #2 straight to ground without battery #1 and see what happens but battery #1 works so I don't know at this point.

Thanks for the info on "A". Yes, the negative is connected between #2 and #1 and both batteries are being charged when engine is running. I have switched the batteries and get the same result and all dash switches and gauges work on battery #1 and both but not battery #2. I thought maybe that...

Hey All, I purchased a Chaparral 1930 SS Sport 5.0L last year and while getting it ready for spring I found out that the number 2 battery doesn't power anything when selected. The batteries are fully charged, I replaced the Perko dual battery switch even the old one tests good, the cables are...