For the last three months ore so, I’ve been battling a battery drain that has kept me grounded. Being that my electronic ignitions require a healthy 12V to operate, any drain below that affects both ignition and my transponder. The xponder is critical cause I fly under Bravo airspace. To the problem: As I taxi my airplane I noticed a rapid battery voltage drain from a normal 12.5V to a no go condition of 11 - 10.5v. I would taxi back , recharge the battery, do a battery drain and charging system test and find no faults. I then decided that I may have too small a wire feeding my main buss. I changed all feed wires from 20 ga. to 14ga with the main being 12ga. I fired it up and no improvement. My last desperate act was to disconnect every wire from the buss and reconnect one at a time to see the effect. The last wire I reconnected was my avionics switch and bingo, it arced and I got the voltage drain This switch has a built in LED which may have shorted and caused a high impedance drain without tripping its breaker. I replaced all switches to regular toggle switches and everything is back to normal. I can now return to my flight testing and planning for the meet. Luis R ClaudioN8981SDallas, Tx.
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