I just had this problem. Fixed yesterday.
Possible causes: bad DS battery, bad cables, bad grounds, battery sensor, bad alternator, or TIPM.
I replaced the PS with the quickness, connected a new Red Top, and it boiled and caught fire..
Went out and bought two this time.
Replaced ground cables and power cables, i figured with $400+ worth of batteries, new cables would be nice preventative measures.
The grounds were internally corroded. Then i cleaned the tray that holds the battery sensor and it had a good inch of mud caked on the sensor (I thought i cleaned everything properly).
Now i guess i got lucky because that fixed it for me.
The bad engineering with the electrical system is a Fuster Cluck. DS gets read, and the PS gets the current?
I ran a single for about a week with no issues.