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Old November 25th, 2011, 01:31 PM
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1988 90
Join Date: Jul 2011
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Originally Posted by Antichrist View Post
Bossman, You're confusing the relay circuit with the motor circuit.
You're not going to have a 29amp starter, which is what 360 watts @ 12v is.
The Pontiac PG260 starter has a 1.4kw motor which is a bit over 116amps @ 12v. That's not going to be fused at 40amps.

Volt drop is typically measured per foot and every foot is going to induce voltage drop. It's a measurable increase as the distance increases and/or as the cable size decreases. At 116amps the overall volt drop is .12v for #2 @ 5'. It's .23v at 10'.

I think I ate too much turkey last night.

I stand admittantly corrected.

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'98 Toyota Land Cruiser 100 Series
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Old November 25th, 2011, 07:23 PM
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1998 Defender 110 CSW 300Tdi
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Location: Queens, NYC, NY
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My god, now this is what I call a technical discussion!

For my 300Tdi I have always just tried to put in the biggest CCA battery that I can buy. For New England winters I am sure your 850 CCA will be fine. Having said that I like the sound of that Sears marine battery ...


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Old November 25th, 2011, 09:37 PM
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Bill Adams
66 109 sw 94 lwb
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CCAs are a pretty misleading method of judging battery performance/capability. The better numbers to look for are reserve capacity ( in minutes) at the 20 amp rate.
950 CCAs are not much good if you only get 60 seconds of them.
Bill Adams

1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"

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Old November 26th, 2011, 08:36 AM
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Tom Rowe
Join Date: Feb 2006
Location: Atlanta, GA USA
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In case anyone is interested, this morning someone sent me a test report on their 300Tdi starter which certified it was within spec.
Max current draw was 731amps.
Median current draw was 457amps.

Tom Rowe
Atlanta, GA

Four wheel drive allows you to get stuck
in places even more inaccessible.

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