I have a used but tested KeyLine 140 AMP Dual Battery Isolator for sale. Price is $35 plus $5.00 shipping to US only. Tested contacts perfect. Only switched to charge batteries once for a test. Pickup voltage is 13.4 and dropout is 12.9. I bought it new. Paypal only. Loren Moline WA7SKT Benson, AZ DM41ux