At 11:37 AM 12/9/2009, Mike South wrote:
>the trip mentioned above) was before the aux battery installation.  Negative
>starter battery post to frame is 1.6 ohms (measured because I read something
>about a poor grounding causing that kind of thing)

Mike, you need to recheck this.  1.6 ohms is an outrageously high
value for the battery ground -- it should read 0 on a regular
ohmmeter.  The practical way to check its quality is to measure the
voltage across the connection while you put a load on the
circuit.  I'd hope to see less than a quarter volt across there while
cranking, for example.

>It's 26 degrees Fahrenheit today.  The voltage across the posts of the
>starter battery was 12.18 cold.  Immediately after I started it, while it
>was running, it measured 11.51 volts..

So, it's not charging.  Is the alt light on?  What's the voltage at
the alternator?

Yrs,
d