I had the same issue and wired unit directly to cranking battery which fixed the problem. There is a voltage drop when starting engine which causes the unit to turn off.
I have a LCX 19 that went bad and am replacing with HDS 7. Lowrance told me that transducer would work but existing water temp would not. Part #106-89 is a transducer with water temp probe attached. Was told the Y connecter I am now using would not work. ope this makes sence.
Check this out http://www.specialtysuspension.com/Quie … c_162.html, I have been using this for about 1 year and it works great. It take all the slop out of your receiver.
I had the same thing happen with mine. Noco does not make a replacement and I am not aware of after market replacement. I wish they would bring it back because it let you know what was going on with your batteries with a quick glance.
Dont know what your budget is, but I have been using the Cul M Rite scale since it came out and been very happy with it. Nothing to mount just a scale that assignees a color tag to fish and will quickly cull after you have you limit