M2 ATX Amp turn on not working

**CdRsKuLL** · 02-17-2006, 05:57 PM

Ok.. as far as I understand the left hand pin on the jumper for the amp turn on should turn on my amp and stop the pop noise that I get at the moment. I connected it up and its not turning my amp on. I got the multimeter out and i'm only reading 5v a cross that jumper is this right ? If not can I do something to fix it other than installing a seperate 5v relay to then send the 12v needed to my amp.. which sort of defeats the object here.

cheers

CdRsKuLL

**Dingo** · 02-20-2006, 11:14 PM

Hello

I just checked the voltage on J6 on my M2-ATX and i get 11.6 volts. If you only have 5 volts then it does sound like a fault.

**JasonWW** · 02-21-2006, 09:00 AM

One of those pins is 12v and the other ground. Did you try measuring from only one jumper and put the other probe on the ground input wire. If your amps only use a 12v signal to turn on, you will only need to use one pin on that J6 jumper.

**OneFast97Z** · 02-22-2006, 10:39 AM

Im having the same problem, i measured the voltage across both pins on the J6 jumper and its reading about 5.11 volts... in the mean time iv hooked my amps up to the ignition power wire... im going to try and measure the voltage from on of the pins and the cars ground and see if i get anything different... amps require a constant 12volts to the remote turnon... if its a fault on the board, just connect your remote turnon wire to your ignition wire and u should be fine, but ull still get the pop at startup...

**nealric** · 02-22-2006, 08:09 PM

I have two amps- one is turning on, the other is is not with the m2. Had exactly the same setup with the m1 with no problems.

I dont have a multimeter but I suspect the problem may be that one of the amps is less sensitive than the other to getting the corrct voltage.

**proph** · 02-22-2006, 08:13 PM

It might not give off enough current to work for both. Install a relay inline.

**nealric** · 02-22-2006, 08:38 PM

The frustrating thing is that the m1 worked fine.

Could you explain the relay thing?

**JasonWW** · 02-22-2006, 08:48 PM

This might help:
http://electronics.howstuffworks.com/relay.htm

Also Google it. A relay can take a tiny amount of electricity to activate it's internal coil and throw the switch on a much stronger set of contacts. You can get Bosch 12v relays at the auto parts store. If you see only 5 volts from your M2, then you might check Radioshack and see if they have a 5 volt relay.

**nealric** · 02-22-2006, 09:18 PM

So if I get a 5v relay, would it be a problem if it were actually putting out around 8v for example?

**JasonWW** · 02-22-2006, 09:54 PM

I'm not sure. Can you find out the voltage for sure?
If it were 8v then I might try a 12v relay and see if it has enough power to turn it on. Or you could use the 5v relay and get a resistor of the right size and run it in series to drop the 8 volts down.