Yep, read my last post, gotta eat my words a little. Maybe those should be
summer numbers. And last week I remember checking an Isuzu NPR that I had
worked on and found those two batteries sitting at about 12.91 volts.
13.51 refers to good battery, idling with the outside temp in the 80's.
14.25 refers to a weak battery that you just recovered from a no-start
condition, and the outside temp in the high 40"s. We're pretty close.
Regardless, 12.1 was pretty close to no-start. When I worked on that Isuzu,
those batteries were at 11.91 the next morning and it was in no-start
condition, just barely. Biff
----- Original Message -----
From: "Ray Block" <bpracing@worldnet.att.net>
To: <dakota-truck@dakota-truck.net>
Sent: Tuesday, January 30, 2007 10:52 AM
Subject: RE: DML: Having some troubles with the truck...
>
>> -----Original Message-----
>> From: Biff Byrum
>>
>> Mr. Block, I kinda disagree with some of your numbers.
>
> Mr. Byrum, feel free...I was generalizing.
>
>> I find good batteries to vary between 12.48 and 12.61v when cold.
>
> No big deal but mine, fully charged, read higher. Now if they've sat a
> couple days....
>
>> CC charging systems put out between 13.51 and 14.25 volts, and that's at
>> idle, with no other electrical load than the engine running.
>
> Again NBD, but my scanner shows mine (at highway speeds) putting out
> 13.4-13.8, depending on..."whatever". Idle speed and stock vs.
> under-drive pulleys may alter the "norm". That's why I generalized.
>
> Ray
> http://www.dragtruk.com/ENTRIES/20KM1FD2KWBP.html
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