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Old 04-14-2013, 08:19 PM
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Puzzling mystery, SLOW CRANK, the Silverado is back :(

This is just stumping me beyond belief.

Over the past week, ive noticed my truck has cranked ever so slightly slower than the previous day (even when the trucks cold). Its never really cranked super fast anyways. But now, its acting like the battery is toast. But its not.

I noticed today that it cranked so slow, I was surprised that it fired up. So I headed right for the parts store. Got a brand new optima battery. Got home, and dropped in the optima battery, and it cranked exactly the same, maybe even slightly slower (as per the pattern). I cranked it with the battery attached, and it dropped to about 10.5 (while cranking). Which I believe is normal.
So I took the optima out (assuming I dont need it after all) and put the old one back in.

I cannot figure this out at all. I probed as much as I could. The battery has 12.9-12.8 with truck off. 14+ when trucks running.

I checked voltage at relay box, it matched the voltage at battery.
I checked voltage at starter hot side, it matched the voltage at batt.
I checked voltage to engine block, it matched voltage at batt.

Each time I crank, it gets progressively slower and slower. This last time I cranked a few minutes ago, it didnt crank fast enough to start. But its still warmed up from previous recent starts. So I will wait for several hours to try again. But the impression im getting is, im running out of lives each time I start it. Since it gets worse every time.

This things got a brandnew battery to starter cable (4mo old) I went through and checked the block to frame ground, and battery to block ground. I just installed a new fuel pump and sending unit (1wk old), and I moved the pump ground from the frame to a cross brace under the truck bed for easier access.
The starter is a few yrs old. And this truck has always had a slower cranking problem. Regardless of starters. So I dont think thats it. The starter is one of those chrome mini starters that allows indexing of the solenoid. So I indexed the solenoid underneath the starter to keep it cooler.
The alt is pretty old, but tests ok.

This is weird. Basically, if I am somewhere, and this thing wont crank and start, a jump start wont even help me apparently.

WHAT THE HECK IS GOING ON?

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Old 04-14-2013, 08:27 PM
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put a new positive battery cable on it ! they do go bad know matter how new!
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Old 04-14-2013, 08:42 PM
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Originally Posted by killeratrod View Post
put a new positive battery cable on it ! they do go bad know matter how new!
When I changed the old one for the new one, there was no difference in voltage drop. So when I changed to the new one, it appears I didnt even need to do so. The problem seems to be somewhere else.
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Old 04-14-2013, 09:32 PM
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Put in a remote solenoid.
Remote Starter Solenoid Instructions
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