what is your cold cranking voltage?
 

went through some interesting stuff a few weeks back when my battery started to go. first gryphon screen didnt come up, battery lasted another week or so then died.

since then, ive been looking at my bat v on every startup. i consistantly get a reading of 10.9 volts WHILE CRANKING after the truck sits overnight.

im not running a optima or anything just interested in other ppl's readings for comparison. :hmmm:

peace

I've never really paid attention to cranking voltage.
Now after a few times of the truck sitting for a week and not having the tender on during that period its been 11.7-12.4 volts before cranking.
I'll make sure to pay attention to this for you and post it up in a couple of days.
Peace!:)

I think you'll find, 88, that the voltage drops into the 10V (or even high 9V) range as you're cranking. That starter is pulling a lot of current. And, my radio, A/C and headlights are almost always on too. The truck is in a garage in low light and the headlights are auto-on.

But, you'll have to have your CTS ON to see it, and I find I rarely turn it on before cranking. Also, if the truck starts quickly, as mine does, you have very little time to see the voltage.

- Jack

Yep.
Kick off some off the amenities like the auto lights and then turn key, wait for the CTS to boot up to the display screen, then start.