Help truck batteries keep dying when its off!!!! - Ford Powerstroke Diesel Forum
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Old 01-03-2014, 10:16 PM
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Help truck batteries keep dying when its off!!!!

My 1999 7.3 has a weird sound under the hood like a vibrating sound coming from what I think is some relay on the left side if your looking at the motor. Its above the battery looks like a round cylinder that had a plug going into it. This vibrating noise happens when the key is off and runs down my batteries so I have to jump it everytime I want to start my truck. When I jump the truck it runs fine and everything but when I turn it off the noise starts and drains my battery happens every time! What could it be!! Do I need new batteries? Or what? Let me know ASAP! Also my mph gauge isnt working along with my cruise control and my overdrive light is blinking what could this be a speed sensor?
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Old 01-04-2014, 06:09 AM
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That "Above the battery" thing is confusing me....

I don't know what could be Above it, do you mean Behind? Like between the firewall and battery? Is it on top of the fenderwell? Could this be the Vacuum Pump maybe?

Take a picture
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Old 01-04-2014, 08:46 AM
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Yeah between the firewall and battery at the top of the fender
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Old 01-04-2014, 09:38 AM
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Old 01-04-2014, 12:16 PM
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That IS the vacuum pump, it sounds like you have a leak but, it shouldn't be able to kill your batteries unless it ran for DAYS...

First thing I would do is have the batteries checked. This time of year, as the cold effects them, batteries that were good all year (or you thought they were ) Crap Out. You want to charge them up and have them individually LOAD TESTED at a high rate (250-300A not those dinky 100A handhelds the Parts stores use on 4clys) to know if they're any good or not. A diesel engine with glow plugs requires good batteries in top-notch condition to work in the cold. Don't skimp on them, you have to bite the bullet and get really good batteries if you need them

Next, figure out what's leaking and causing the pump to run all the time, the hoses that go the the ft hubs w/ESOF 4WD are a common problem (if you have that) but you have a leak if the pump runs for more than a min or two...
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Old 01-08-2014, 06:29 PM
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Pump shouldn't be running with ignition off. Should only run when in 'run' position.
Sounds to me like you have a bad ignition switch, stuck relay or somethin is back feeding.
Very similar to my issue I have which I think I have solved now. My fuse panel under the dash had got water in it, as had the GEneral module. I had similar symptoms. Erratic speed sense (tried all the usual changing VSS etc) and an electric hum under hood. Wasn't vacuum pump though.
Sounds like 2 issues. Ignition circuit staying energized after key off. And a vacuum leak. Since pump should only run until reaches set vacuum pressure. Maybe pump, or reservoir cracked. 4wd pulse solenoid leaking or damaged line somewhere.
Worth changing speed sensor, since not that expensive.
But I'd see if you can see any sign of water or corrosion under dash panel behind fuses.
Try unplugging the pump and see if your batteries drain again.
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Old 01-09-2014, 07:16 AM
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Quote:
Originally Posted by Unclebobsuncle View Post
Pump shouldn't be running with ignition off. Should only run when in 'run' position.
That's an EXCELLENT Point! I Totally missed the "Key OFF" part of the description...

That pump should certainly not be running.
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Old 01-11-2014, 05:13 PM
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From the picture is looks like you have some "crud" on the top of your battery so you may have a surface discharge, take a DMM and put a lead to the negative post and the other to the top off the battery case. You should see very little voltage, if you do see some voltage, clean the top of the battery with baking soda, works great.

Last edited by Slayton93; 01-11-2014 at 05:15 PM. Reason: Misspelling
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