Charging problems

Discussion in '911 Diesel Down!' started by onebadiditurbo, Apr 27, 2017.

  1. onebadiditurbo

    onebadiditurbo Full Access Member

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    My 1994 f350 with the 7.3 Idi, I drive this truck nearly daily and keep an eye on gushes so it's a new problem. I get in it start it all seems normal, turns over fine and starts, battery guage fluctuates while GP's cycle, usually it jumps to normal after they stop but it didn't this time. I leave out thinking the cold snap might have drained a little more juice but it never did charge up. I get to my jobsite and check voltage at the pass side battery running it's 12.8vdv. I kill the truck, finish my shift same thing as before, I make it back home go to look at it this morning both batteries are at 11vdc with cable unhooked, so I'm charging batteries and gonna try to check a few more things, this is my service rig and I leave in 6hrs so some check points to weed out some time would be appreciated.
     
  2. DaveBen

    DaveBen Supporting Member Supporting Member

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    When did you last replace the batteries? Sounds like you are due for two new ones. Always buy both batteries at the same time or you will kill the new one by using it with the bad one.
     
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  3. steelheadguy

    steelheadguy Registered Idiot Supporting Member

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    Check for loose cables. Maybe check the voltage while running to see that it is charging. My batteries read 12.99 volts when fully charged. I believe alternators should be around 14 volts when charging.
     
  4. onebadiditurbo

    onebadiditurbo Full Access Member

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    The batteries aren't that old, less than 2 yrs, I'm measuring output from the alternator and my understanding is that it should put out at least 13vdc. I did charge the batteries up individually and started the truck so I could do some more testing and within about 5mins the alternator was so hot I couldn't remove the connectors from it.
     
  5. IDIoit

    IDIoit MachinistFabricator Supporting Member

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    if your alternator is bad, it will ground out between the 12V+ lug, and the case.
    replace alternator and check cables.

    how bad is your idit?
     
  6. onebadiditurbo

    onebadiditurbo Full Access Member

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    My Idit was pretty spry but wants changed and I sold it to acquire my current rig but it's n/a.

    I ordered the alternator ima put it on today and see, the drain and the low charge rate was getting to me because I was overthinking things hopefully.
     
  7. IDIoit

    IDIoit MachinistFabricator Supporting Member

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    so it should read "oncebadiditurbo"
     
  8. onebadiditurbo

    onebadiditurbo Full Access Member

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    Haha lol, but sure, don't you make custom Idi parts, wanna hook me up on my current?

    Oh btw I replaced the alternator and so far things seem well, figure I'll give it a day or two and see if it drains the batteries again.
    I appreciate the help guys.
     
  9. ISPKI

    ISPKI Lumber Chucker

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    Hey, im having the same issue and im curious if the new alternator fixed yours
     
  10. onebadiditurbo

    onebadiditurbo Full Access Member

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    Yes so far it seems to have. Let me know if yours works or doesnt.
     
  11. frankenwrench

    frankenwrench overkill is under rated!

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    I had same issue in my build and replaced with a 100 amp alternator without results just to find out one of my grounds weren't tight on the back of my heads against firewall. Worst part was I installed a turbo and of course it was on the passenger side head behind the up pipe. Lol
     

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