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Thread: Help! Supra doesn't run right

  1. #181
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    Default Re: Help! Supra doesn't run right

    Quote Originally Posted by Piratetip View Post
    Could be a ton of different things.

    Connect an ammeter in series on the negative battery terminal so all the current is going through the meter.
    Do not turn on any lights or other high current components or you may blow the 10A fuse usually in multimeters.
    Trick the hood sensor that its closed.
    Fully turn off the vehicle and lock / enable security system (if it has it), everything you would normally do to leave the vehicle.

    Get a baseline amperage reading once the vehicle has fully shut off.

    Start pulling individual fuses to see which one(s) drop the amperage significantly.
    Once you find a circuit that might be the culprit you can continue diagnosing it further.

    Would also suggest checking stray current discharge going into the coolant system, this is usually caused by bad grounding / on engine / vehicle ect..
    Can also lead to galvanic corrosion on internal coolant system components.

    TIP:
    Vehicles should have a quiescent or key off load of approximately 10 - 60 milliamps.
    Most vehicles are ~ 20mA

    (That's 0.020A)

    Anything higher and you have too much draw somewhere and should be fixed.
    1510702113049329134422.jpg

    Which setting would I put the meter on, just double checking to make sure I'll be on the right setting.
    2007 BMW 328i, daily driver
    1997 Chevrolet Camaro z28 6 speed, fun V8
    1987 Toyota Supra turbo 5 speed, new toy

  2. #182
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    Default Re: Help! Supra doesn't run right

    20171114_174914.jpg

    Got another banjo tap and installed it. Still emailing back and forth to get the broken on fixed. They most likely will send me another one so I will have two which I'm fine with as it is better to have a spare.

    20171114_174856.jpg

    I also received this one today as well. Could use this one as well if I ever need to.
    2007 BMW 328i, daily driver
    1997 Chevrolet Camaro z28 6 speed, fun V8
    1987 Toyota Supra turbo 5 speed, new toy

  3. #183
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    Default Re: Help! Supra doesn't run right

    Quote Originally Posted by Abe's 1987 View Post

    Which setting would I put the meter on, just double checking to make sure I'll be on the right setting.
    red wire plug into 20A max connector.
    set dial to A= 20A

    Read current. If 0000 then
    red wire plug into mA jack.
    change dial to 200m

    (As noted above, be careful, you short the wire, turn the ignition on, or hit the starter and your unfused 20A connector will melt.)

  4. #184
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    Default Re: Help! Supra doesn't run right

    Quote Originally Posted by 3p141592654 View Post
    red wire plug into 20A max connector.
    set dial to A= 20A

    Read current. If 0000 then
    red wire plug into mA jack.
    change dial to 200m

    (As noted above, be careful, you short the wire, turn the ignition on, or hit the starter and your unfused 20A connector will melt.)
    I concur with this.
    Make sure you have zero loads on when you have the meter in series.
    You want to measure the milliamp current loads of the vehicle off & not blow the fuse in it.

    As pi mentioned, the wording on your meter indicates the mA leads are fused and the 20A leads are not.
    I have actually never seen a meter with an un-fused ammeter setting, slightly odd.

    Just be careful, don't want to blow it up.
    I rebuild / upgrade Supra Differentials - PM me for more information.

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  5. #185
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    Default Re: Help! Supra doesn't run right

    Ok so I disconnected the battery + and - terminal and removed the battery out of the car. I hooked the red lead to + terminal and black lead to - terminal. Did on 20A max and got 0 then did on mA and still got 0. Hopefully I did it right!
    2007 BMW 328i, daily driver
    1997 Chevrolet Camaro z28 6 speed, fun V8
    1987 Toyota Supra turbo 5 speed, new toy

  6. #186
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    Default Re: Help! Supra doesn't run right

    Wait, what?
    Without a battery in the system there will be zero power/amperage/voltage anything.

    Leave the battery in the car and leave the vehicle positive cable connected to the battery.

    Disconnect the negative vehicle cable and connect 1 lead from the meter to that cable.
    Connect the other lead of the meter to the battery negative terminal.
    Best to use clamps on the leads of the meter so you don't have to hold them.

    It needs to be in SERIES which means all current passes through the meter for the vehicle.

    Photo example.
    http://pop.h-cdn.co/assets/15/47/768...mx0610140a.jpg
    https://i.ytimg.com/vi/n5FJDgcdii8/maxresdefault.jpg
    I rebuild / upgrade Supra Differentials - PM me for more information.

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  7. #187
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    Default Re: Help! Supra doesn't run right

    Nvm i figured how to hook it up. It was reading at 0.06 with hood simulated as closed and everything off. When i take out the radio no 1 fuse in the engine bay it drops to 0. Any ideas?
    2007 BMW 328i, daily driver
    1997 Chevrolet Camaro z28 6 speed, fun V8
    1987 Toyota Supra turbo 5 speed, new toy

  8. #188
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    Default Re: Help! Supra doesn't run right

    Aftermarket radio?
    I rebuild / upgrade Supra Differentials - PM me for more information.

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  9. #189
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    Default Re: Help! Supra doesn't run right

    60 mA doesn't sound like enough to kill the battery. Any chance a courtesy light was left on, maybe in the hatch? A 50Ah battery should last a month with 60mA drain.

  10. #190
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    Default Re: Help! Supra doesn't run right

    Quote Originally Posted by Abe's 1987 View Post
    Ok so I had gone out of town this weekend and came back to find out something has completely drained my battery. I know for sure all light were off and key was not in ignition and ignition is in the off position. When i left Friday volts were at 12.2 and I checked today Tuesday with volts reading at 1.5. Now i need to figure out what is draining my battery. What can be running without the key in the ignition?
    Also FYI, a battery sitting at open circuit with no load showing 12.2 V is already down to about 60% SOC.
    A fully charged battery at 100% SOC should have an open circuit voltage of 12.7V.
    AGM batteries shift slightly higher on the SOC / OCV curve, about ~200mV over standard flooded batteries.

    Agreed with pi.
    You had to have something else left on.

    0.060A draw for say 2.5 days is only going to pull out 3.6 Ah from the battery.
    That wouldn't have taken the battery down to 1.5 V in that short amount of time.

    What group size battery are you using?
    What is the age, brand ect..?

    I happen to work as an engineer for the largest manufacturer of automotive batteries in the world, so just trying to understand the full picture here
    I rebuild / upgrade Supra Differentials - PM me for more information.

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