Bad Batteries, weird problem
I have a 2001 powerstroke with bad batteries. This morning is was about 30F and I forgot to plug in the block heater. So first attempt was a no start. Got out my 6amp battery charger and hooked it up. While I waiting for this slow charger, I thought I would plug in the block heater to warm up the engine a little. Something odd to me happened. When I plugged the heater in, the battery charger amp guage dropped a little. Thought I was seeing things, I unplugged the heater and the needle went back up. I thought the heater was not tied to anything electrical on the truck. So how does it effect the charging of the batteries? Anyone have any ideas?