Over the past two weeks I have noticed that initial cranking on startup is slow. At first I thought it was in my head, but it has gotten more noticeable. It is like a gas engine with too much intitial timing, slow on the first revolution, then picks up. Luckily my truck starts pretty quick with a little pedal. Anyway, when I first noticed it I looked at the battery cables and they looked good, cleaned them anyway. I redid the negative cable ends because the factory ends were no longer clamping the posts effectively. I switched over to military style clamps (another idea I picked up here
) for the negative clamps. I thought this would do the trick, but only a slight improvement.
The starter in the truck is about a year old, from NAPA. The Red-top Optima's are about 18 months old and the alternator was rebuilt locally last summer. And all has been issue free until about 2 weeks ago.
Both batteries read 12. 72-12. 76 at rest, but still connected. I think that is good?
Voltage in the truck has never been an issue, since the rebuild, always above 14v. I checked at the batteries today and saw only 13. 8-13. 9 while idling all accessories off, I was expecting 14. 2 or more?
Tomorrow weather permitting I may drop the starter, check the positive cable and have a look inside. I remember my old starter was covered with oily residue inside from the blowdown tube. Maybe this starter is suffering from the same thing?
I don't think its a charging issue, but am not sure. Could the battery cables be corroded internally, offering up resistance?
My Haynes manual didn't offer up a whole bunch of info on trouble shooting.
Any ideas what should I look at next?

The starter in the truck is about a year old, from NAPA. The Red-top Optima's are about 18 months old and the alternator was rebuilt locally last summer. And all has been issue free until about 2 weeks ago.
Both batteries read 12. 72-12. 76 at rest, but still connected. I think that is good?
Voltage in the truck has never been an issue, since the rebuild, always above 14v. I checked at the batteries today and saw only 13. 8-13. 9 while idling all accessories off, I was expecting 14. 2 or more?
Tomorrow weather permitting I may drop the starter, check the positive cable and have a look inside. I remember my old starter was covered with oily residue inside from the blowdown tube. Maybe this starter is suffering from the same thing?
I don't think its a charging issue, but am not sure. Could the battery cables be corroded internally, offering up resistance?
My Haynes manual didn't offer up a whole bunch of info on trouble shooting.
Any ideas what should I look at next?