@Hondasxs, I think I figured it out and I am telling you so you might can help others if they have a similar situation. I first removed all of the connectors from both batteries and cleaned them. I then re-installed them using a very small amount of electric contact grease. After all is back together, I removed the aux cable at the isolator, fired it up, and retested with the multi-meter. I then measured 14.1 VDC and 13.8 VDC. I reconnected the Aux battery cable and gauge wire, when I checked the gauge in the dash I got nothing. Neither gauge is reading any output. I went back to the isolator and was looking for what could make this happen and BOOM there it was. The ground wire from the isolator was damaged from no telling what so I fixed it and all is well. I still would like to get an isolator from you as a spare so if you could PM me at your convenience I will be in your debt. Thanks to all of you fellows that helped me.
