relay NO is open no power between com and NO the NC is closed power between com and NC is there operate the relay the power between the NO & NC should swap if you have power between NO & com you have a bad relay or the NO &NC are swapped and if the relay does not operate check the power input

I will power the receiver from the ESC and hopefully all will be ok.
The battery and receiver were just to test the relay switch before I fitted it into the tug I am building.
Thanks again for all of your advice and wisdom, you have all taught me so much.👍

Les,
Graham is correct again. Most radio battery packs are realy designed and sufficient for powering the receiver and servos only. As soon as one adds more servos or, as in your case, relay switches, the battery pack becomes insufficient to satisfy the needs of the system.
A long time ago, in my first class on basic electrical systems, my teacher said,nad I paraphrase, "always start at the battery because 75% of the time, that is where the trouble is". A great lesson learned. 😀

Just an additional note. I am not sure if this applies here but if a separate battery to that running the ESC is being used, the negative of the switch units has to be connected to the negative of the main battery also.
Peter.

Hi Les,

Great that you have it working now. If you are planning to power your receiver from a separate battery, it would be worth using 5 cells rather than 4. If you are going to power the receiver through your ESC then check the voltage from the ESC to your receiver to make sure it’s over 5v. (From what I’ve seen, they are usually closer to 6v)

Graham93

Thank you so much to all of you fellow members who sent a message to help solve my relay problem, I have learnt so much!

The problem was my battery that was powering the receiver, it was below 5v and it would not power the relay on the relay switch to turn the bulb on.

I have fully charged the battery powering the receiver and the relay switch is working fine as you can see from the photos.

Thanks again to everyone who sent a message for all your help.

A picture is worth a thousand words (see picture).

If still having a problem connect the relay board to the receiver, match the SWITCH on the transmitter to the same channel on the receiver (depending on what you have, you might need to go through a transmitter setup routine). Do not connect your sound /smoke/light/whatever to the relay board yet.

Use an ohmmeter or continuity light. Going across the NO and C terminals the meter or light should indicate the circuit works when you flip the switch on the transmitter.

If this doesn't work, remove the relay board plug from the receiver and plug in a spare servo. Power on the system and flip the switch again to see if the servo moves.

If this fails it is likely the transmitter switch is not programmed to the correct channel and from there you need to go to the setup manual.

As for the receiver, your relay board specs are: Minimum input voltage from receiver: 5v DC, Maximum 10v DC.

Whatever you are powering, the relay board spec is Maximum relay throughput: DC14 volts / 20amp (which should be ample for most model boat accessories).

Lew

Good thought Graham.
I would also suggest checking the voltage required for the switch, if possible. I say this because on many current radio systems, the receiver side of things, are now designed to operate on from5 to 7.2 volts or more. My new BEC's are selectable to that range.
I have another thought. I have run into this situation, where a dedicated switch channel does not send a signal at the full range of signal width that is available on , say, proportional channels. If I recall correctly, a similar situation occurred with an electronic switch. I pulled many a hair, they weren't gray back then, and some how stumbled upon the answer when I plugged the switch into a proportional channel. Of course, that didn't work still, but when I added the trim button range, viola, the switch worked. I am not saying that this is the case here, but an option.
You may also have a bad relay, solder connection on the board, or many other possibilities.
With luck, your battery pack meeds charging. If you have a BEC that you caan power your receiver pack with, that may be worth a try as well.

I just had that thought myself, spooky!

I will charge the battery pack overnight and make sure I have enough volts.
🤞

Hi Les,

One more thought. Is your receiver battery fully charged? I notice that the specification for your relay switch states a minimum supply voltage of 5v. You are using a 4 cell battery. If it isn’t fully charged, it could be less than 5v and may not have enough power to operate the relay even though it is OK for the receiver.

Graham93