Xerlude

So today is my 2nd day of owning my MDX and I could not start it after getting home from the pool with the family. It looks to be an issue with the charging system. Last night I drove the car from the Boston area to NJ with no issues. The dealer where I bought the car had mention that they recently had replaced the battery but i did not think much of it at the time, but it looks like this issue is not new. From my testing today it looks like the charging system can not keep up with the cars load demands. With the AC, vented seats, radio, USB phone charger(worked fine for years on my Explorer), rear entertainment and headlights on, the charging system was putting out 12.7V at the battery terminal. With out these loads the car is putting out about 14v. I've tested the battery and it looks good after i charged and did some load test on it. I must add that I do not know the voltage range that the MDX should be putting out because the service manual is so hard to come by, but it should be standard to most other cars.

I'm still searching the forums but has any one else had similar issues?

Xerlude

This morning the charging system is over charging the battery, off to the dealer.

neo1738

Keep us updated. Sorry they sold you a car probably knowing it had some problems.

Xerlude

Update:
I took the car to a local Acura dealership(DCH Acura) on Monday not where I bought the car from and they ran a number of test on the car, both the battery and the charging system tested fine. The service department was telling me they think the car was left in accessory mode and that drained the battery. This is very much possible as this is my first "key-less" car. It's been five days now since the car would not start after being parked for 2 hours with no issues. I've also driven the car about a 1000 miles and no issues. I'm watching the charging system very closely and I've noticed that the charging system voltage is running any where between 14.2V to 12.3V. While driving it 12.3 to 12.7V which to me does not look right but i'm not sure if this is something that voltage regulator is doing. I'm looking in to purchasing a service manual so i can know for sure.