why do diesels have 2 batterys - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 06-10-2011, 02:15 AM Thread Starter
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why do diesels have 2 batterys

Why do wr have 2 battarys in our trucks do we run on 24 volts

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post #2 of 14 Old 06-10-2011, 02:16 AM
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No, they are wired in Parallel. They run at 12v, but double the amperage. That many amps is required to turn over a diesel when it's cold since there is no 'spark' to assist the starter has to do allot more work. Some equipment has up to 6 batteries just so it can't turn over.

The same reason your remote control needs 2 AA batteries, not one. The remote is the same voltage as the battery, but it still needs two.

Series:



Parallel:

Last edited by Austin G; 06-10-2011 at 02:21 AM.
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post #3 of 14 Old 06-10-2011, 09:11 PM
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^what he said. Not to mention glow plugs suck up an insane amount of power... running one battery wouldnt exactly do too well for long, they'll start it(done it b4) but the battery wouldnt last lol.
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post #4 of 14 Old 06-10-2011, 09:16 PM
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the glow plugs and starter require a ton of amps to run. so two batts = double the hp behind the volts.

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post #5 of 14 Old 06-10-2011, 10:28 PM
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Seen guys run four batts in their pickups before.

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post #6 of 14 Old 06-11-2011, 02:16 AM
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Seen guys run four batts in their pickups before.
Did that for a while, but the day after the 3yr warranty on those Optimas was up, the truck started having starting issues.

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post #7 of 14 Old 06-11-2011, 07:29 AM Thread Starter
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Oh ok thanks guys nice diagram

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post #8 of 14 Old 06-11-2011, 08:03 AM
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Quote:
Originally Posted by Jarrod B View Post
the glow plugs and starter require a ton of amps to run. so two batts = double the hp behind the volts.


High compression engine needs the extra juice to turn it over, and the glow plugs suck up something like 1000 watts to start.
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post #9 of 14 Old 06-11-2011, 08:58 AM
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Did that for a while, but the day after the 3yr warranty on those Optimas was up, the truck started having starting issues.
I hear bad things about optima's. unless interstate at some point stops their pro-rated warrenty of 72 months (2 year full replacement), i dont think i'll be switching.

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post #10 of 14 Old 06-11-2011, 09:27 AM
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I'm running Die Hard's from Sears, they were roughly $250...

3 year replacement warranty, and I believe 100 month pro-rated warranty.

And it DEFINITELY starts quicker!
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