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Slow Battery Drain...... hopefully solved

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  • Slow Battery Drain...... hopefully solved

    My car could always sit for weeks at a time and then start right up but over the past two years, after only 7- 10 days of sitting the battery would be dead. My first thought was the small Genius Boost Jump Starter that I bought and left plugged into a dual USB I installed in the trunk. So I unplugged it and no change... battery would still die within 10 days. Being lazy and not wanting to go crazy chasing a battery drain, I just left the trickle charger on between drives.... :-) This year I ditched my Garmin GPS that would plug into the cigarette lighter and opted for just using Waze on my cellphone. That required a USB adapter so I got a small one to plug into the cigarette lighter, plugged in a cable and routed it to hide behind the kidney pads when not in use. Worked great but now my battery would die with in a week of sitting..... the little light bulb in my head went off.... both the trunk dual USB for keeping the charger charged and the glove box cigarette lighter are always "hot" so even if nothing is plugged in the charger is drawing from the battery. I've totally disconnected the trunk Dual USB and pulled the USB out of the cigarette lighter. The car has now sat for a little over two weeks and the battery remains at full charge..... hopefully my mystery is solved.
    1975 Mimosa with a few upgrades/mods:
    Patton TBI
    HVDA Toyota 5 speed
    Goodparts Nissan Diff
    Goodparts CVJs
    AAW Wire Harness
    Miata Seats
    Boyd Welding Custom 15 gallon aluminum gas tank

  • #2
    Interesting Bobby....Seem a little unusual as it would do the same in any other cars....
    Triumph TR6 - 1974 - Mimosa, O/D, black interior.

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    • #3
      Several years ago, I tried to chase down a milliamp draw from the battery when everything was turned off, and the key removed from the ignition. Over a few weeks the battery would always be drawn down until it wouldn't turn the starter. As far as I know, only the radio may still draw current; being an old car, the Triumph has no "hot" electronics always active. I, too, put a trickle-charger on the car (poor decision - it was a cheap one) and fried my Optima gel battery in the process. Now, although I bought one of the really good trickle chargers, I use a disconnect on the ground side of the battery (one of the $10 'green knob' types). With the Sears AGM battery, I can let the car sit for months with no activity and the battery retains its charge. I never found the offending current draw - suspect it was or is a corroded fitting somewhere allowing leakage to ground - but all is now well.

      I have the same problem with my 2007 F150, which sits for weeks unused - so I put a disconnect there, also, but learned a lesson; you can't pass the emission test if you have disconnected the battery, unless you drive for a couple of days. The OBD II goes brain dead with no power.

      We live and learn!
      1976 TR-6 BRG - CF57239U
      Carbs by Poolboy
      Rear Camber Kit, Rear Hubs by Goodparts
      Gear Reduction Starter by TSI
      Distributor by British Vacuum

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      • #4
        Quick update..... car sat for a month with no battery drain..... yep.... a beautiful September and I didn't drive it from 9/15 - 10/12. Only change was that I disconnected the dual USB charger in the trunk (wired so always hot) and the USB charger in the cigarette lighter in the glovebox (also always hot). Prior to this the battery would be "dead" in 7-10 days.
        1975 Mimosa with a few upgrades/mods:
        Patton TBI
        HVDA Toyota 5 speed
        Goodparts Nissan Diff
        Goodparts CVJs
        AAW Wire Harness
        Miata Seats
        Boyd Welding Custom 15 gallon aluminum gas tank

        Comment


        • #5


          Nothing like the satisfaction of solving a nagging or perplexing problem...
          '74 TR6 CF13007U aka "Mr. T"
          Custom Blue (Delft-Like) and New Tan (Formerly Mallard and New Tan)
          Points, Ballast Bypassed, Bosch Blue Coil, Moss Cobalt Wires, Champion RN12YC plugs.
          Peaks and tweaks, but the spirit of Original
          Redlines always.
          My wife is the Driver, I'm just the Mechanic....

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          Slow Battery Drain...... hopefully solved

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