Davtron yoke clock

[Shadrach]

So I've had a Davtron M800 digital chronometer that's been sitting around the hangar for months. My IA gave me the go ahead to install it yesterday, he will inspect after I'm finished.  My old clock was battery operated. The new one is to be wired hot full time. I am looking for suggestions as to the best way to accomplish this. I have no "always on" source of power in the panel that I am aware of. I'd hate to have to pull the interior and run a line all the way from the battery, but that's looking like my only option. Any recommendations would be greatly appreciated.

[Andy95W]

Ross-

Take off your top cowling, check your master relay.  One of the small terminals is always hot.  Use a ring terminal on 20 gauge wire and add this to the hot terminal.  Fish the wire through an existing wire bundle (20 gauge is small and will fit almost anywhere) and then through the firewall with an existing wire bundle. Add a 1 amp fuse to the hot wire and run it to the clock.  You may have to lie on your back on the floor with a good trouble light if you have a 201 windshield without access panels.  

Set the clock as you drink a beer.  Easy!

[carusoam]

There are a couple of things that are not on a switch on newer Mooneys.  Check the cigar lighter to see if it is hot.  My clock and my FF gauge are also hot.  Anything with a memory in it may be kept hot...

Some Mooneys have lights in the interior that are always hot.

If nothing comes to mind from that, the POH has some simple electrical diagrams.  If it shows everything going through a solenoid, you are out of luck.  But, running a wire won't be too challenging, except it will be all the way from the back by the battery...

I have learned to kill a couple of batteries over the years with these circuits.

These are only ideas. I hope to inspire some thoughts that are helpful.

best regards,

-a-

 

Edited October 9, 2015 by carusoam

[Andy95W]

I checked the wiring schematic for the 67 F.  Unless modified, I think Ross is stuck going through the firewall.

[carusoam]

Battery and solenoids up front would be helpful for that.  My 65C was up front.  Some of the mid bodies went to the tail.  The Long Bodies get a pair of batteries in the tail.

Best regards,

-a-

[Shadrach]

Ross-

Take off your top cowling, check your master relay.  One of the small terminals is always hot.  Use a ring terminal on 20 gauge wire and add this to the hot terminal.  Fish the wire through an existing wire bundle (20 gauge is small and will fit almost anywhere) and then through the firewall with an existing wire bundle. Add a 1 amp fuse to the hot wire and run it to the clock.  You may have to lie on your back on the floor with a good trouble light if you have a 201 windshield without access panels.  

Set the clock as you drink a beer.  Easy!

I think my master relay is behind the baggage compartment. It's a always hot, I believe the master switch just grounds the relay. I wish it was just the firewall. There are a few areas where I could go through withot cutting. Unfortunately, I think I'm going to have to remove interior panels...

[Andy95W]

I think my master relay is behind the baggage compartment. It's a always hot, I believe the master switch just grounds the relay. I wish it was just the firewall. There are a few areas where I could go through withot cutting. Unfortunately, I think I'm going to have to remove interior panels...

Crap, I forgot they moved the battery to the back for the long bodies.