I have a 2009 Nissan Rogue and have been having problems with it starting. I’ve had to have it jumped several times the last few months and I’ve assumed it was a dead battery from not using the car in a week or more. A few weeks ago it was totally dead, no dash lights, my Viper wasn’t working all, nothing. But it jumped instantly and started fine. Brought to autozone and the tested the battery and said it’s voltage was fine and suggested getting the connectors changed. Go to garage and tell them (the second time I went there for this problem- said the battery tested fine last time so they didn’t do anything) and they only cleaned the connectors and said everything was fine and nothing needed to be replaced, just cleaned out some corrosion. Couple days ago it wouldn’t start again. Mechanic I know came and looked around under the hood and he said he couldn’t see anything out of the ordinary. Brought over his scanner and jump pack today and jumped it. Scanned it and the voltage in the battery was jumping around from over 16 to under 12 while it was just idling after the jump. Had me turn it off and try turning it back on and everything was immediately dead again. Said it may be the alternator but he couldn’t get a good scan with the voltage jumping around.
Any ideas? He also said it could be electrical with the viper alarm but he said he honestly never seen anything like this. (He did say it was odd when I told him the other day I hit a couple bumps and the stereo muted itself. )
I have a video on my phone of trying to start it before it was fully dead but I don’t know how to post it since it says it’s not a correct file type.