Out of town, slow crank, HELP please. - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 03-15-2013, 03:22 PM Thread Starter
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Out of town, slow crank, HELP please.

I am out of town until tomorrow. Problem started today with a slooow crank. Starts fine after running a while, but drains back down in a couple hours. Load tested batteries at O'reilly, said they are fine. Tested alternator, said it has low amperage and bad diode.

My question is, can a bad diode cause a drain on the batteries, but still charge when driving? If so, Can I just unhook the alternator tonight to keep from draining batteries overnight, and hook it back up for my drive home in and morning. I'll fix it all when I get home just don't have the means to change an alternator right now.

Thank you!!


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2006 F250 Lariat CC FX4

Current Mods:
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post #2 of 4 Old 03-15-2013, 03:58 PM
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yes a bad diode can cause a drain overnight. cause the dioides are what is called a zener diode which works as a one way valve of electrical flow and a bad one will let battery power run to the alternator field at all times ad drain batteries.

yees you can just unhook your alternator and re-hook that should help

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post #3 of 4 Old 03-15-2013, 04:13 PM Thread Starter
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Out of town, slow crank, HELP please.

That's what I was hoping to hear. Thank you sir!!


Sent from AutoGuide.com App

2006 F250 Lariat CC FX4

Current Mods:
4" MBRP Exhaust
58v FICM w/ performance flash
Blue FPR Spring
SCT w/ tunes from Matt (SRL, 8k Tow, Unlim. Tow)
Edge Insight CTS
1200rpm High Idle
Coolant Filtration System
6.4 Banjo Bolts
ARP Head Studs
EGR Delete

Sold: 1997 F250 PSD 4x2 5 speed
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post #4 of 4 Old 03-21-2013, 01:04 PM
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Not to bust chops,but.... Alternator on these can be changed in the parking lot with 2 simple wrenches.

03 F350 SD 6.0 PSD FX4 XLT CC LB SRW See my visitor messages for my mods
To see why you should avoid Sinister Diesel, visit these threads:
http://www.powerstroke.org/forum/6-0...e-leaking.html
http://www.powerstroke.org/forum/fee...m-customs.html
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