jstanofficial

Hey guys I have a 2006 e350 4matic, my rear battery (main) is on its last leg and I’ve been having to jump it when I’m home, it sits a lot, I play on the road for a living so sometime months, runs great, everything works great, but now the radio comes on with logo then goes out, I’ve tried everyone’s solutions with fuses and what not, even the cd changer runs, I can hear it when i crank it, is it because my main battery is so low? Had it tested and was told it only 200 cranking amps, alternator is fine. Is does thro a code sometimes about conventional functions unavailable temporarily due to low battery, but only when it’s been sitting, once I start driving it goes away, keep in mid two the batterrry is probably zapped fl e aide the car is black and has sat for two months in the hot Florida sun, but everything else is great, any help would be appreciated

octoroll

Perhaps you should just replace the battery first? Check to see if you have any parasitic draw too.