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Old 12-23-2011, 09:28 PM   #1
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Default Elecrtrical problems please help

I am having electrical issues in my touring car, I need some ideas or direction on solving them. This is what I have and some ideas. The speed control just stops working and does not transmit any power to anything. Turning on and off doesn't work, once the power is gone it doesn't come back. All electronics are less than a year old.

Possible issues discussed so far....
-X-12 motor has seen temps around 220
-X-12 motor has had soldiering iron press on tabs for too long
-X-12 motor may have has a small drop of soldier run down the wire tab. (no obvious signs though)
-Bad speed control (multiple tried and all failed)
-Possible issue with servo

I am going to replace the motor with a Rev tech 17.5 and eliminate the much more fan.

-Team Associated TC6
-LRP SXX Stock Spec (new version)
-Futaba BLS551 servo
-Spektrum SR3100 receiver
-LRP X-12 17.5 stock spec
-DX3R Remote
-AMB transponder
-Much more high speed fan

Please help
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Old 12-23-2011, 11:37 PM   #2
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What battery and connectors are you using?

Start by eliminating possibilities, it's possible something is drawing down the BEC so hard that it can't reset.

First, inspect ALL the servo leads VERY closely along their entire length. If there's any damage anywhere, fix that first. Second, check your battery connections very carefully, they should fit tightly.

When power goes out, use a voltmeter and see if the ESC is seeing any power from the battery on the B+ and B- terminals.


If all of that is good:

Unplug your servo, transponder, and fan, you should just have your ESC connected to the receiver, motor and battery. See if power still goes out and never comes back.

If the same symptoms are there, disconnect the motor and try again [keep the phase wires separated].

If everything seems good, plug in the servo and track test, if possible.

If it's good from there, add the transponder back.

If it's still good, try the fan again.

If the symptoms come back when you add a component, try a replacement, if possible.

If nothing seems to fix it, try another receiver.


Troubleshooting isn't a black art, figure out what does, and doesn't work, as methodically as possible, and you'll save time and money fixing your problem.
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Old 12-23-2011, 11:57 PM   #3
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Thanks for the help, is there a way to reset the bec? or does it reset itself?
Im using deans and all is tight
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Old 12-24-2011, 12:31 AM   #4
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It'll reset by itself.

What I meant was something could be drawing it down so far that it can no longer supply voltage to the radio system. Once you figure out what's causing it, if something with the ESC isn't at fault, it should work fine again.
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