FAQ_mwrt12_20131029 Rev 2013_10_29
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Q. How do I know the transmitter is working?
A. Whenever the transmitter detects the edge to be compressed, it will send a 3 second pulse,
which is evidenced by the green LED lighting on the transmitter circuit board.
Q. My MWT12 is not sending a signal, I am not seeing the green transmitting LED come on.
What could that be?
A. Normally, just replace its batteries with fresh size “AA” type. Typically batteries last at least a
year, but will vary with usage.
You may also test by first removing the connector that is holding your two edge wires from
the transmitter circuit board. Then, press the Test Button on the transmitter circuit board to
see if the green LED lights for 3 seconds and then go off.
Q. My transmitter is not lighting up the green LED? How can I localize the problem?
A. First, check your battery for proper voltage: measure across each batteries 2 terminals with
your meter, looking for approximately 1.5 volts.
Second, try the “test” button: Remove the connector that is holding your two edge wires from
the transmitter circuit board and press the Test Button on the transmitter circuit board to see
if the green LED lights for 3 seconds and then go off. If you don’t see the green LED, this
indicates a defective transmitter.
Third, check the edge wires or the edge itself: check out your edge wires for any cuts or
abrasions. If that looks good, you should next “meter/ohm” out the edge. Connect either
probe of your meter to either edge wire and connect the other probe to the other wire. If your
meter allows, set the Resistance scale to it’s lowest scale (RX1) and compress the edge.
Depending on the edge, you should get a low reading, possibly less than 1 ohm. If that
appears normal, set your Resistance scale to it’s highest scale, if possible, and see if you get
any reading. Essentially it should be an open circuit or a very high reading , 3 megaohms or
higher. If you get a varying reading and or something lower than 3 megaohms, it is indication
that moisture has infiltrated to the interior of the edge. Check the edge again for a tear or
opening, chances are you will find one. The edge will need to be replaced.
Q. My MWT12 batteries seem to be going dead too soon. What can I look for?
A. Believe it or not, it is typically a defective “new” battery. Always keep your fresh batteries in
their original packaging or a suitable container. Never use a battery that’s been floating
around in a toolbox or glove box.
If you are in a cold weather environment, try using a lithium battery instead of alkaline. The
lithium gives better cold weather performance.
Q. Can I mix and match transmitters and receivers with other units on my truck.
A. No, with no known exceptions, you must always match like brands at the same frequency,
together. These units operate at 318MHz, and are only compatible with Miller Edge 318MHz
models.
