The battery load tested good with my tester at the shop. Our tester is probably 40 years old so I'm going to take it to where I bought it in the morning and let them test it to double check. It's a Deka Maintenance free 24M7. 800 CCA It does not have an amp hour rating on it. The group 24 battery may just not have enough back pocket to run the LS along with one or two Helix units.
Does anyone know what the amp draw on the LS is? If not I'll call Gamin tomorrow. I'm going to measure the amp draw tomorrow to see what it is actually pulling.