I'm trying to figure out what's killing my battery. I'll provide all relevant symptoms and info so this might be a bit of a long post, sorry!
I bought an 09 Ram 1500 Sport about 7 months ago. It has the Alpine Speakers, REN Mygig head unit and no modifications that I know of, as I bought it used at about 120,000 km.
First problem was that randomly the battery would drain overnight caused by the radio turning itself on and perform random functions- screen would turn on (but stay black), could hear the disc spinning up and speakers would humm. This seems to be a common issue with these trucks. The volume glitch never happened until recently though.
A couple weeks ago the truck started dying every night. I figured it was the radio finally glitching out permanently so I installed a relay to cut the power completely when the truck is not in acc or run. I figured this would solve the problem and the only problem would be not having the clock showing the correct time anymore. I installed the relay to the head unit only- not sure if amp needs to be cut as well, but it was effective in killing the head unit cold.
This still didn't solve the problem. I tested the amperage drain across the negative battery terminal with the keys out, doors closed and the hood lamp pulled. My multimeter showed a reading of 0.62 on the 10 Amp setting. I think this means 6.2 amps???? Either that or its .62 amps- either way, its way too high. I'm going to assume the 6.2 reading is the right one, regarding other measurements but If someone could verify or correct this, I'd love them. (The multimeter is product number 25-1031-2 and if this link works, this is it: http://www.canadiantire.ca/AST/brows....jsp?locale=en
I pulled all fuses today: I only tested on the 10 amp setting so it may not have shown smaller draws. I came up with a total of 4.5 amps from the following fuses: [Fuse / Amps / Description ]
M39 / 1.2 / IOD Amp/Radio
M34 / 0.2 / Bat - CCN/Interior Light/SCM/Sw Bank
M41 / 0.6 / IOD - SDARS ves 2-3/DVD/HFM/UGDO/Vanity Lamp
M42 / 0.5 / IOD - HVAC, U/Underhood Lamp **I pulled the underhood lamp
M38 / 1.0 / IOD - CCN/Interior Mods
J03 / 0.5 / Batt - Passenger Door Node
J07 / 0.5 / Batt - Driver Door Node
Again, those amp figures could be wrong- maybe move the decimal one place to the left?
That's all the info I have so far. The GF said she heard the speakers come on again after the relay was installed but the head unit was dead. Maybe I need to put a relay cut off on the amp too, or maybe its something totally different.
There are a lot of things drawing power but they seemed to all be related to the center console controls/entertainment. Could the wiring harness be frayed and shorting somewhere?
If I can't figure this out, I'm considering just adding a second battery that's isolated so I could basically just boost myself when needed. Once it's started it runs perfectly fine. I'll definitely be installing a custom stereo system this year because although I like all the features, this mygig crap is garbage. It's just let its customers down too hard. I love my truck but this is embarrassing.
Thanks to anyone who has read this all and might have any ideas. Have a great day guys.