Having trouble with a very old trolling motor. Would likely help if I was smarter.

I have a 12/24 old Motorguide, 2 batteries and a connection cable.

Two wires coming from the Trolling Motor have thin blue lines.

I can get my 12v to run but not the 24v option


This is for my second boat, a pontoon that I cant see which wires.

I have both wires with a thin blue line running to one battery ans the two without to the other.
I have the “jumper” cable running from one positive to the other negative.

Any help would be awesome.

Thanks
Ryan

Some of the old 12/24 volt trolling motors had a switch that controlled the 24v.

Its under the trolling motor head. i used to have the same problem lol