Sear's Hobby Page

Disclaimer: I am not an experienced nor licensed electrician. For those interested in doing this mod, please do your research. The information I have posted documents what I have done and by no means THE method that should be followed.

I've been reading about the use of relays on AEG ever since the use of lipoly batteries became widespread. The main reason for using it is to prevent the trigger contacts from burning up without spending a lot of money on buying MOSFETs.

When I bought my first lipoly, the idea of using a relay also came to mind. Reading threads in FAS and websites on the design and function of the Bosch relay gave me the information needed for this mod. The pictures below illustrate the different diagrams used to wire the relay in the gun.

Prior to the installation, I needed to check space inside the stock to make sure that there would be sufficient room for the relay and the battery. G3 stocks are smaller than M16s, and there is just enough space for a standard 8.4v large-type battery. I did not want to do any sort of modification on the battery compartment that might weaken the structure.

Here is another diagram that I have already tried. Notice that the negative wires are the ones connected to the trigger assembly. The positive (red) wires are limited to pin 87 connecting to positive point of the motor. Pins 30 and 85 are connected and then another wire from pin 85 connects to the positive contact of the battery plug. The result, nothing happened. When I pulled out the cover of the relay, I noted that the when the battery is plugged, the way the wires are connected created what is called an "open" switch. This means the no power is flowing through the coil of the relay.

After the last attempt, I muddled over the problem and decided to use positive contacts on the trigger assembly. In this diagram, the wire connected to pin 87 runs through the trigger contacts and then to the positive point of the motor. This means one needs to pull the trigger to make current flow. I will be trying this set up on the weekend and post updates.