eddallen

We ALL continually learn, if our minds are open to the task. Glad all is well.

Haha before you tear the boat apart looking for a battery, remove the pos from both deep cycle bats and the crank bat, then see if electronics will turn ON.

OK sometimes if the charger is ON, when you disconnect one of two batteries the charging channel for that battery can remain open (supplying voltage). If you unplug the charger it will close that channel. Which two batteries is the 2-bank charger feeding? What all is on your boat? Might there be a house battery for your electronics?

The straight up answer is you CAN NOT get 36 volts from two 12v batteries. Did you disconnect both cables from the crank battery? If so, try un-plugging the battery charger and see what it reads.

I think 1.5" is OK. Is there a windshield in front of the MFD? Makes it better but you should be good with 1.5".

1" Ball is too small for 7" display.

Is this for pond fishing (transom mounted)? Battery life seems to be minimal at best.

If I read your post correctly, you can see the entire USA map. Can you tell where the boat icon is at on the map? If it shows you somewhere around the Tulsa area, you probably have the unit in Simulator mode. If the boat icon shows you 'roughly' in right area, then you may be zoomed OUT way too much.

These may help

Not sure 'which' trolling camera you are speaking of. I can recommend the Water Wolf 'in-line' camera which you can use trolling, casting, from a bobber, or on the bottom. These cameras are really great and produce some fantastic videos. I must caution you tho, using these cameras could become habit forming!

I have not seen anything 'universal' that worked as good as something made 'specific' to that same product. I have never used an electric trolling motor, but, I have set up several for my customers. I have only converted one setup and that was because of CHIRP. My customer had a 1kW Airmar CHIRP transducer and wanted to share this across his network. He too, was satisfied!

Can you show us with your electronics in place?

OK so that is definitely electronic noise and sometimes these gremlins can be hard to tackle. Where are the TM batteries located? Where is the MFD located, console or bow?

Why don't you try West Marine in Lake Ontario? (585) 323-2040

Can you post a pic of the screen during the interference? It's possible that the TM is creating air bubbles that travel along the hull and over the face of the transducer...possible. You can check this while underway using the TM and looking astern at the transducer.