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| 1999 to 2003 7.3L Power Stroke Diesel 7.3L Power Stroke Diesel equipped Super Duty and Excursion |
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#1
Wed, March 16th, 2011, 05:32 AM
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Emergency truck died
Ok my battery light started blinking. thought it was my belt slipping. tonight my electrical started going out, first the radio then stuff on the dash went weired. i shut the truck off and it won start up again. The batterys are reading both 11.4 Its raining so i couldnt unhook and test the battery's individually. So is it my Alternator or battery?
I have no cars i wrecked my honda please help. 
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#2
Wed, March 16th, 2011, 07:46 AM
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Everytime the battery light has come on on my truck I have had to end up replacing the alternator.
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Bob- 2003 F250 Lariat 7.3PSD CC SB FX4 Kwik (6637) Filter, RE 2.5" leveling kit, F350 Rear Blocks, TC Lock, Fumoto, EBPV/Exhaust Brake,6.0 Tranny Cooler, AIH Delete, IssPro EV2 Gauges, PHP Phoenix stock, 25tow, 40tow, 65tow, 80dd, 100perf, In-tank mods, Muffler Delete, WW, FRx,HPx, JW Stage 1 Trans, Swamps HV/HF IDM -Pulling a 38' Forest River Sierra 5th Wheel 
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#3
Wed, March 16th, 2011, 02:26 PM
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The only thing the battery light is hooked to is the voltage regulator on the alternator.
Good call, Bob.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes. SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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#4
Wed, March 16th, 2011, 03:06 PM
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Alternator for sure. Just replace it and make sure you charge the batteries before running the truck with the new alternator. If not it could cause damage with too much time charging from a dead state.
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F250 Reg Cab - 1,172 HP / DJ# / 11.56 Fuel Only / 10.94 Nitrous / Dyno Run 10-2009 -------------------------------------------------- Wide Open Performance - Engine, Chassis Build Swamps Diesel Performance - Injectors & IDM Gearhead Automotive Performance - Stage II Cam
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#5
Wed, March 16th, 2011, 06:59 PM
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X2!!! ^^^What he said^^^ An alternator is not a battery charging device. It is a battery maintaining device.
You COULD have a totally shorted battery or something that is preventing the alternator from charging them. Before you jump in and change the alternator, try charging BOTH batteries. At no load, about 3 hours after charging, they should read about 12.7V. Anything less is an indication of a weak battery. A battery charge of 11.4V is a totally dead one. When a battery gets pulled down like yours were, it is not uncommon for the battery to be bad too, in addition to a possible alternator failure. (Aren't vehicles fun?) - Jack
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 2014 F150 Platinum SCrew 3.5L EcoBoost 4x4 with SCT programmer
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#6
Wed, March 16th, 2011, 07:35 PM
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ok well i have been bad and the battery light has been flashing for a couple weeks. I have a alternator im going to go pick up in an hour. Also O have a large radio with and amp so im sure the amp drained one side of the batteries. I will let you know my findings soon ty for the help.,
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#7
Thu, March 17th, 2011, 04:51 AM
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I seemed to of fixed it Ty for your help :-) know if someone can help me out with one injector harness
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#8
Thu, March 17th, 2011, 08:35 AM
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Quote:
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01 F350 7.3 4x4 CC SRW/3.73/315-75-16/Aeroforce Interceptor/BD Thruster II/ Bellowed Up-Pipes/4" turbo back exhaust/CCV Mod/DIY 6637/FPR Shimmed to 65 PSI/TS chip reburned with PHP tunes (Stock, 40T WITH Whsiper tune, 80DD, 100R, 140Ex, 140SS)/Replaced and Cleaned EBPS & Tube 4-6-12/Zoodad mod/Recon smoked cab lights/MM Hubs/Cowl Hood/HPx
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#10
Thu, March 17th, 2011, 06:25 PM
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It was the alternator! Batteries are fine.
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Linear Mode
