Stupid Question - Ford Powerstroke Diesel Forum
 
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post #1 of 4 Old 06-09-2011, 10:43 AM Thread Starter
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Stupid Question

Why do diesels have two batteries under the hood?

2004 Ford F-250 6.0 CC SB
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post #2 of 4 Old 06-09-2011, 11:01 AM
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The current demands for getting these engines started are HUGE. There is a pretty big load from the glow plugs to preheat the system. Then you must still have enough juice left to rotate a high compression engine several hundred RPMs to get it started. Lastly as you are doing all of this, there needs to be enough power on tap to run the electronics that fire the injectors and run/ monitor the engine. From the perspective of a gas engine all you need to do is rotate the low compression engine and make a tiny little spark.
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post #3 of 4 Old 06-09-2011, 11:06 AM
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Takes a LOT more current to start a diesel. However, The e-series have one large battery.



2005 Lariat CCSB F-350 SRW
300,000 miles and going strong

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post #4 of 4 Old 06-10-2011, 03:31 AM Thread Starter
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Thanks I don't feel stupid anymore.

2004 Ford F-250 6.0 CC SB
  • Edge Evolution
  • K&N FIPK Intake
  • MBRP 5 in Turbo-Back
  • 6.4 Banjo Bolts
  • Blue Spring Upgrade
  • Zoodad Mod
  • Sinister EGR Delete
  • BPD Oil Cooler (Condenser Mount)
  • SCT SF3 with tunes from Matt




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