First thing every morn. I have to jump it off at the starter. won't work at battery. after 1st start, it will start fine all day. Battery checks out fine. It's like the power does not get to the starter when it is cold. ???
It sounds like possible bad batt cable or connection as it takes a bit more batt power when engine is cold to crank engine. if you have a volt meter, you can check this. set to volts dc and put one lead on batt neg. post and one on engine block, crank engine, in theroy you should not see any voltage but if you do, that is whats lost in neg cable, in my exp. you will see about .5 volts if you see too much more than that, i would be looking at cable. you can do same thing on pos. side but keep in mind if you go from batt pos. to large stater pos. at stater and you have a ext. sol. like ford likes to use that your loss could be in the sol. contact as well. And under cranking mode your batt should drop to no less that 9.6 volts under load and thats tested at batt post.
Answers & Comments
It sounds like possible bad batt cable or connection as it takes a bit more batt power when engine is cold to crank engine. if you have a volt meter, you can check this. set to volts dc and put one lead on batt neg. post and one on engine block, crank engine, in theroy you should not see any voltage but if you do, that is whats lost in neg cable, in my exp. you will see about .5 volts if you see too much more than that, i would be looking at cable. you can do same thing on pos. side but keep in mind if you go from batt pos. to large stater pos. at stater and you have a ext. sol. like ford likes to use that your loss could be in the sol. contact as well. And under cranking mode your batt should drop to no less that 9.6 volts under load and thats tested at batt post.