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Parasitic draw from tcb fuse, leaves battery dead. I have found the source of the draw, how do I solve the problem? Battery is drained after 7 hours whether running or sittimg.

Has stock radio, no aftermarket accessories although the previous owner did have an aftermarket radio

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  • broth
    broth May 01, 2015

    Thank you for the responses, the fuse whic is drawing is TCB. 25 minutes after going to "sleep" the TCB fuse draws .50 amps *(miliamps I beleieve) on my multimete. Removal of TCB fuse located under the hood. I understand there will be sunk cost in repairing the vehicle, i am just hoping to minimize the cost and am very willing to do the work myself, but am rather ignorant in the understanding of electeicity. I have taken the alternator to a auto parts etore for testing, they saod it was fine bit it sounds like step 1 should be taking it to a shop. Thanks for thehelp, I will reoprt my progress back here

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  • Cars & Trucks Master
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You say you've found the source of the draw, but you really haven't. "tcb fuse" isn't a specific source, only the identity of a group of things. You will need to identify what is on that fuse, and which one of those is causing the drain.
If your alternator is indeed putting out, no rational drain will cause your battery to go dead while you're driving. Think perhaps your alternator isn't "fine", but may have one or more bad diodes. I had three replacement alternators go bad within a week each time. Rebuilt alternators can go out quickly...

Posted on Apr 30, 2015

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  • Cars & Trucks Master
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IS that TCB or TBC there are both systems. If it is TBC that is a throttle body controller and it could be bad injectors or throttle sensor. If it is TCB then it is the computer that controls all the internal things in the cab like the door locks, climate control, radio, blinkers, remote start or remote entry. If it is this device then it is located behind the dash and can be a real job getting to it.

Posted on Apr 30, 2015

  • Brad Brown May 01, 2015

    What make model and year?

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Batteries that drain down while driving are putting out more current that is being received
That means that either
A=== the alternator is not being driven fast enough--- slipping /failed/incorrect drive belt
B === the alternator is not charging or is not charging dc volts--- faulty rectifier pack or faulty regulator
the fact that you do not like parting with hard earned money is a major draw back here as you will eventually spend more to fix a problem than most would '
Alternators can only be properly tested on a bench by an accredited auto electrician .
local parts stores have no expertise in this area

Posted on Apr 30, 2015

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Take it to the dealership and have have them to a diag. It might be cheaper in the long run or less hassle.

Posted on Apr 29, 2015

Testimonial: "That is really, really obvious advice. If I didnt want to solve this problem I would obviously take it to theSTEALlership and part ways woth my hardearned money, but thatt does not align with my constitution. Again I have pulled the TCB FUSE and the draw dies. The truck slowly dies while driving... which makes me think it could be the computer, a bad alt (but I had it chdcked n tested at local parts store), battery is only 5 months old. If there is someone out there who can help poimt me in the right dorection it'd be greatly appreciated, thanks."

  • David Payne
    David Payne Apr 30, 2015

    I did not say HAVE THEM REPAIR IT rather have them do a diag on it or troubleshoot it then you can decide what ot do from their. Bite your pride. If you spend your wheels on a problem for more than 15 minutes on anything GET HELP or be open to suggestions. I hate to see you waste time and energy going blindly or guessing at it costing you ALOT OF MONEY. Either way I wish you the best of luck with it.

  • David Payne
    David Payne Apr 30, 2015

    DO IT RIGHT, DO IT ONCE, DO IT QUICK.

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Do you see a brake light on while driving? That could be a bad alternator.

Ask your garage to perform a parasitic draw test - you could do this with a multimeter, as well; it sounds like something is draining your battery while off - it could be any fuse and not obvious like with lights on/etc.

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The recommendation for maximum parasitic drain is around 30 mA (0.030 amp). A typical drain today actually falls into the 7-12 mA range, even though some vehicles do approach the maximum. Multiply the drain (in amps) by the time (in hours) the battery sits without being recharged. The result is the amount of AH consumed by the parasitic drain. The actual drain may be small, but over time the battery grows steadily weaker.

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3.5 amp wont drain a battery over night nor in a week i'm assuming you have at least a 500CCA battery here.

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