Thanyou, this is very helpful advice. I will make a checklist to make sure that this charge order is followed as my memory is not the best after a long day on the water.
Do you mean the TM will cause reading errors on the DF when they are running from the same source? If it is hooked up to the TM battery I will more than likely leave it that way. I'm hesitant about running the DF or any other units off of the main starting battery. Learned it the hard way and was stranded on a lake with no power.