Duel sub troll anomaly

[Steve.e]

Hey guys and gals, I started running dual sub trolls recently and for some reason the port sub troll temp is mimicking the starboard  temp. I raise the starboard rigger up or down , as temp changes so does the port temp matching pretty much exactly. How can this be when the signal goes up through the cable and they are completely separated up to the power source box. Any ideas or past experience?

[kayaker919]

No experience, but some ideas....

 

The signals do share a common "return" through the water, so that might be coupling somehow.  However, I would think the starboard probe would swamp any signal coupling.

 

I assume you verified the starboard probe works with the port probe not in the water?  

 

If you swap probes does it follow the probe?  If yes, maybe low battery in starboard probe?

[Steve.e]

If I get out again, will swap probes first and bring new batteries also. Thanks for the ideas.