Batteries.

[TulsaDave]

I will try to update it. I only have a Mac computer, and everything they have is windows only. I'll have to go to a friends house to do it.


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[USAFBowman]

I noticed the same thing with my CTS and it is up to date. Not real sure whats going on there. Let me know if you find anyting out

[cartmanea]

Originally Posted by catlinB

if your near any truck dealerships you should try pricing batteries there. the local parts places here wanted $100-150 per battery for 850CCA. i got two 1000CCA batteries from the local international dealership for $100 a piece. there a little taller, but didnt have any contact with anything. warranty was the same or better then some parts stores also. with higher CCA and less $$.

Can you check and share with us what Group # those batteries are? I'd be interested in finding a larger size that fits.

Originally Posted by TulsaDave

Yes they isolated my batteries. My wife's uncle runs an autozone and I trust him. After I fire it up sometimes it'll read high 11s for a little bit, then instantly shoot to 13+. I'm thinking the CTS is having an issue with this one.

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The delay in voltage rise is normal. The alternator is not energized until after the glow plugs turn off to reduce alternator stress.

Check voltages with a multimeter with both engine off and after it's started and alternator is charging. You are correct that it appears your alternator is fine, but if 11.5V is accurate, then you have a battery issue. I would guess one battery has a shorted cell, normally this takes battery voltage down to 10.5V or so, but with another good battery in parallel it could settle higher. Also, when you check the OFF voltage, disconnect the grounds so you can check the batteries individually.

Your batteries testing at over 13V tells me they didn't test them correctly. Unless the alternator is running or a charger is connected to a battery, it won't read over 12.7V or so. When they load test them, they normally drop into the 11V range.

[Snake]

KOEO you're drawing power (glow plugs, vacuum pump, fuel pump are the big three). Check your batt volts key off with the CTS and I bet they're around 12.5v. The jump from 11v to 13v after a few seconds of idling is also normal. However, it's not because the alternator isn't energized (the alternator DOES come on immediately after start up). It's because the alternator can't keep up with the glow plugs as they complete their cycle (roughly 90 seconds after key on).

[TulsaDave]

Good to know snake... It's taking me a minute to learn all this stuff. Your help is greatly appreciated!


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