Please fill out the following to ask a question. MAKE: Ford MODEL: E350 YEAR: 2006 MILES: 168,500 ENGINE: 5.4 liter DESCRIBE ISSUE.... Battery dies because of cargo lights. I kill a battery in about two years because I have seven LED cargo lights and a cab light that stay on for about 10 minutes after I open a door. I run a Handyman Business. I have to charge the battery about every 10 days. The charging system is in good order. I even installed a volt meter in the cab to monitor charging and voltage levels. Battery will be at 12.6 volts when fully charged, or driven a distance. Voltage output is 13.8 to 14.2 Yesterday the battery was at 11.0 volts... you guessed it... no start.....jump from a customer. My goal is to add a dual battery system with an isolator system that charges the main battery and then the secondary battery. My question is : For the time being can I install an auxiliary battery and run cables to it in parallel from the main battery. This way I still am running 12 volts, but two batteries. I have two brand new batteries here, a 850 CCA for the main and a 770 CCA for the auxiliary. This would be temporary until I get a dual battery install kit and all the extras I need, and the time to do it all. Now I need to hear Yay or Nay and why please. Thank you.