- E350 Super Duty
- 5.4 liter
I installed a dual battery system, most of the ideas from this site. Van operates on a single battery when ignition is off and dual batteries when ignition is on. I installed a indicator light on the dash that lights when the dual battery system is activated. The problem is that the dash light burns out after a few months. I installed a 10 amp inline fuse to the light, in case I was getting a power surge. I am using a standard indicator light. A LED bulb would have to wired in, and I the NEON was only available in 110V. Is it possible to put a resistor in line to cut down the 12 volts a bit to increase bulb life? If so could you tell me which one? Thanks.