M1225 Ign Sense Connection Question

njscan · Post by **njscan** » Mon Jul 10, 2006 3:18 pm

I'm going to be installing an M1225 and I need to have it turn on / off with ignition. I'm wondering if anyone can explain how pin 10 (Ign Sense) <http://www.batlabs.com/images/sm50acc.gif> feature is used and activated?

I'm thinking that switched 12V is applied to pin 10 and somewhere in RSS that option must be activated?

Thanks

n1pfc · Post by **n1pfc** » Mon Jul 10, 2006 5:34 pm

njscan wrote:I'm going to be installing an M1225 and I need to have it turn on / off with ignition. I'm wondering if anyone can explain how pin 10 (Ign Sense) <http://www.batlabs.com/images/sm50acc.gif> feature is used and activated?

I'm thinking that switched 12V is applied to pin 10 and somewhere in RSS that option must be activated?

Thanks

You need to open the radio up and cut the green fuse. There's a label on the board that says 'CUT FOR IGN SENSE'

unless you re-connect the fuse or replace it entirely, the radio is now an ignition sense only based radio. You also still need to connect the main power lead to constant power and a good ground.

Kurt

MetroMan · Post by **MetroMan** » Mon Jul 10, 2006 5:36 pm

I'm pretty sure the M1225 uses an internal fuse between the ignition sense line (pin 10) and the main A+ feed. Pull the cover off and look for a small green pico fuse and cut it out. It's on the top side of the circuit board and not far from where the main power and option plug are located. This is the same setup as the Maxtrax used. If you're brave, you can power up the radio and quickly ground a wire from pin 10 to ground and blow the fuse but I've seen the fuses replaced with jumpers and if that's the case, you'll be jumpering open foils.

n1pfc · Post by **n1pfc** » Mon Jul 10, 2006 5:40 pm

MetroMan wrote:I'm pretty sure the M1225 uses an internal fuse between the ignition sense line (pin 10) and the main A+ feed. Pull the cover off and look for a small green pico fuse and cut it out. It's on the top side of the circuit board and not far from where the main power and option plug are located. This is the same setup as the Maxtrax used. If you're brave, you can power up the radio and quickly ground a wire from pin 10 to ground and blow the fuse but I've seen the fuses replaced with jumpers and if that's the case, you'll be jumpering open foils.

I'm not brave enough to purposely pop the fues in the radio.

what I usually do is just cut one leg of the fuse right next to the board and pry it up slightly. That way you can make the radio run without ignition sense without having to re-solder a whole brand new fuse in (which involves removing the whole board). You just have to resolder the leg to the pad.

And yes I know it isn't as strong as through hole, but if you're bashing the radio around that much, you should have more than an M1225

MetroMan · Post by **MetroMan** » Mon Jul 10, 2006 5:58 pm

I agree. I'm not that brave (aka foolish) enough to take those chances.
However, there was a time with the Maxtracs where you were sure a new unit had the fuse and the radio was already bolted in when somebody decided they wanted ignition sense.

I do the cut and lift when I can.

njscan · Post by **njscan** » Mon Jul 10, 2006 6:10 pm

Thanks!
Now just have to figure out how to open the radio. Think that was covered earlier, elsewhere on the site.

n1pfc · Post by **n1pfc** » Mon Jul 10, 2006 6:22 pm

Pull the volume knob off, tip the radio upside down, pry slightly on the rear of the tab in the middle of the radio. Pull lower body of radio back while holding on to the top cover. Should slide right apart.

Much easier than the maxtracs / GM300's to take apart. It is also essentially the same case / layout as an SM50.

Kurt

M1225 Ign Sense Connection Question

M1225 Ign Sense Connection Question

Re: M1225 Ign Sense Connection Question