Yep…Id just leave the flasher in the dash, even if its not working. I have a Lowrance 1440 in my boat, but have never tried running it with the HB turned on. In my 06 CougarFTD, if I ran the Lowrance flasher with the Lowrance 332c on at the same time, neither of them would read depth well at all. So there was a lot of interference in that rig.