charging issues

[banshee-rider]

on my 05 f250 6.0L iam having a hard time keeping the batterys charged i have a new optima yellow top on the drivers side and a red top on the passengers side and a new oriley 180 amp alternater. its been kind of hard to start in the morning it has been cranking pretty slow any ideas connections look good.

[banshee-rider]

can anyone help???

[powerstrokemike]

i would bet that one battery is pulling the ohter one down.. battery's should be replaced in pairs... others will chime in

[QMartinez]

My truck was doing the exact same thing and it turned out that my alternator wasn't charging enough at idle. Once I would get above 1500 rpm it would charge correctly. This caused my batteries to slowly drain when idling so it would get harder to start and crank slowly.

I had mine tested while on the truck at checker auto.

[PreviousLife]

I noticed mine doing that too, in another post they mentioned a circut to the alternator thru fuse 29. I took that out and it had crud on one blade cleaned that up, then through paranoia checked a bunch more all looked ok.
After that it seems to be charging, I'll get a test this weekend with the mild weather, going to be in the 20's. no jacket kind a weather.

[banshee-rider]

it turned out to be the alternator

[Shockley6.0]

same thing happened today...got it replaced for free....love warrenties. Just a question though....why one yellow and one red....they are two different batteries.

[banshee-rider]

i had one warrentied out and upgraded but havent had the other upgraded to the yellow top yet