Ahicks don’t go to sleep tonight. Go to you airplane and rearrange your installation before it’s too late. You have violated some very basic rules about radio installations that should be corrected right away before something tragic happens. Here is what I understand from your post.

You have connected two batteries in parallel. This does increase your battery capacity but decreases you reliability significantly. When two batteries are connected together, the weaker battery will always be a load on the stronger battery. Should either battery fail it will pull down the good battery.

I don’t know what the IBEC is but it sound like you are using the same battery for the receiver and ignition. That is about the worst thing you can do and it should be changed immediately. It sounds like you have survived so far and you are very lucky. You should go find an electrical engineer, preferably a radio frequency engineer, and he will support what I have said.

Sorry, but that is the way it is. Here is something I put together a few months ago.

Your engine generates a spark around 100 times a second. Each one of those has the potential of containing radio frequency components that fall within the band that your radio is operating on. They radiate around the ignition system as an electromagnetic field and are conducted within all its wires going to and from its batteries and spark plug. By bringing the control wire to the switch from the receiver you violate all the advice from the radio manufacturer to isolate the radio components from the ignition system by eight to 12 inches or as much as possible. It is possible to pick up this RF through conduction and radiation. A lot of the guys ignore that by doing what is convenient or less expense and get away with it. This gives them a sense of security that is very false. This is good because I hate to see guys go in but all you need is a few seconds of sparks that are on your frequency and you will lose control. A ground check is also irrelevant because those nasty few sparks on your RF may not occur at that time.

Dan.