Low Battery warning on radio - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 11-08-2010, 07:28 AM Thread Starter
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Low Battery warning on radio

When I start the truck the radio flashes a low battery signal, and the lights and radio shut off. About 20 seconds later they come back on.

New batteries? Or should I get the alternator tested?

I'm spread kind of thin right now and dont really have alot of time to dedicate to this, so any help appreciated.
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post #2 of 7 Old 11-08-2010, 12:34 PM
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Take it to advance or napa etc.... and have them load test your batteries

2005 F250 Reg cab LB XL

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post #3 of 7 Old 11-08-2010, 03:22 PM Thread Starter
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new batteries in place. Didn't really have time to get them tested. Hopefully they solve the problem.
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post #4 of 7 Old 11-08-2010, 06:01 PM
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When I start my truck the voltage drops to 11.8 untill the fuel heater shuts off and then climbs to 14.1 or so.
Been doing that ever since I owned it 3 years ago. Have 2 alternators that equaly charge at 30 Amp each at the time.

2005, 6.0L, 6 Spd Std, 3.73 Rear End, F250SD, Extended Cab, 4 x 4 Long Bed. 2008 extension mirrors. GPS/TV/DVD/CD/Rear Cam/Radio installed, Max Energy programer by Hypertech, and Fuel Pressure Gauge. ScanGaugeII for 60 plus XGauges, and MPG. ELC Cat EC-1 Coolant, Pull a 39ft 15500Lbs 5th Wheel Camper Trailer. Mileage Avg is 20MPG, and pulling 12.6MPG.
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post #5 of 7 Old 11-09-2010, 04:54 AM
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Quote:
Originally Posted by caissiel View Post
When I start my truck the voltage drops to 11.8 untill the fuel heater shuts off and then climbs to 14.1 or so.
Been doing that ever since I owned it 3 years ago. Have 2 alternators that equaly charge at 30 Amp each at the time.
That drop is from your glow plugs, i believe in 04 or 05 they stopped using the fuel heaters.

OP - Fix your problem?

2005 F250 Reg cab LB XL

Airaid CAI
4" MBRP straight pipe from the turbo back.
RCD EGR Delete
Upgraded Banjo Bolts
Zoodad Mod
Swamps HOT FICM
Lariat Captains Chairs with woodgrain center console

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post #6 of 7 Old 11-09-2010, 05:11 AM Thread Starter
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Quote:
Originally Posted by MUDSTROKIN' View Post


OP - Fix your problem?
truck fired up this morning like a champ.

I am guessing that one of the batteries has been fading over the last couple weeks. As it has been having sluggish starts recently.

FYI- the low battery signal on the radio went away in about the same time that the glow plugs turn off. So I am guessing the one good battery didnt have enough juice to keep the glow plugs, lights and radio going.
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post #7 of 7 Old 11-09-2010, 05:40 AM
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Same thing happened to me. Started to have slow sluggish starts had my batteries load tested and one of them wouldn't hold a charge at all and put out absolutely nothing. was about as useful as hooking my battery cables to a block of wood lol replaced the batteries and now she fires right up every time

2005 F250 Reg cab LB XL

Airaid CAI
4" MBRP straight pipe from the turbo back.
RCD EGR Delete
Upgraded Banjo Bolts
Zoodad Mod
Swamps HOT FICM
Lariat Captains Chairs with woodgrain center console


Last edited by MUDSTROKIN'; 11-09-2010 at 05:57 AM.
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