Battery went dead, not sure why but after I jump started the car (2010 XKR) I only have about 1/2 power in the steering.. Any ideas?

 

I'm going with electrical gremlins in the PS circuits. Advise disconnecting and fully charging the battery before hooking it back up and trying again. These cars are very voltage sensitive and most likely the modules aren't talking.

 

I like this puzzler
if there is a relationship at all,
My guess would be- low rpms and power
Due to faulty alternator.

 

How about connecting the battery directly to the power steering pump for maximum power?

 

Was jump start done directly to the battery or to the two connectors in front of the rear light cluster?

 

The jump start was done as shown in the manual. Battery terminal behind the little door and the ground post in the spare tire well

 

Read the flippin service manual and mind my original post... The steering has electronics controlling the hydraulic valving. The valve isn't allowing full pressure to the ram. Your jump starting a low battery has the system at the very least confused. Unhook the battery and charge it fully before moving forward.

X150 service manual, page 639