2008 Jeep Commander 4X4 Hemi won't start

scottme

It ran fine last night. This morning it is completely dead. Not even a hint of any kind of power. The battery is in good shape. Could it be a relay?

Mr_Shiftright

If you mean dead, dead, dead, as in not even having any headlights when you switch them on, then something has either drained the battery, or perhaps the battery cables are corroded or loose. You could try removing and cleaning the battery cables, If that doesn't do any good and the truck is completely dead, then you'll have to charge up the battery (on a charger, not a jump start), and once fully charged, have a parasitic drain test done on the truck--if you have a volt/ohm meter and want to do this yourself, you can look up on YouTube how it's done.

If the battery charge starts the car right up, and there's no parasitic drain showing, then you'd want to have the battery itself load tested.

The only way I could see a relay involved is if it got stuck and drained the battery.

scottme

I put it on the charger and it did not even bring lights up

Mr_Shiftright

How long on the charger? If the battery is indeed dead, dead, dead, then it's going to need an overnight at least at low amperage.