EMS DB37 Red Wire Confusion

jvolkober

New Member
Joined
Apr 26, 2009
Messages
32
I'm easily confused, so bare with me.  I found that I was not getting a voltage reading or rather I was getting 0 volts.  I have triple checked the connection, which is the red wire that was twisted with the black and yellow wire, which I have assumed to be the wires connected to pins 1, 2 and 3.  As write this, I beginning to realize that this might have been a bad assumption.  I am beginning to suspect that these wires are from pins 14, 15, and 16, nicely twisted togehter to go to the fuel flow transducer, rather than another set of red, yelow and black wires that current go to the transducer.   Can some confirm this for me.  I have already taken the shell of the DB connector, which is now in an awkward location.  So before I pull the connections off the fuel flow transducer and re-route the wiring, it would be great to have confirmation this.

As they say, building is a learning experience. Ghrrrr!

John
 

jvolkober

New Member
Joined
Apr 26, 2009
Messages
32
::) My own reply.  I went back out to the garage.  Put the mutlimeter to work. Yep, 0 ohms between pin 1 and the connection to the fuel flow transducer, the wire that is suppose to be the 15 volt output from pin 15.  Oh well, a little re-work is in order.


John
 

jbeaver

New Member
Joined
Mar 29, 2010
Messages
97
Location
San Jose, CA
Re: EMS B37 Red Wire Confusion

If I hook pin 1 or 2 of the EMS DB-37 connector directly to the battery bus (not downstream of the master contactor), will there be any leakage current inside the EMS when the master is off? Put another way, would I be better off hooking these pins up on the other side of the master contactor so that there was no applied voltage when the electrical system is turned off?
 

dynonsupport

Dynon Technical Support
Staff member
Joined
Mar 23, 2005
Messages
13,226
It'll pull about 200 microamps (about .2 millamps), which is basically nothing, unless you keep your airplane in storage for a few decades :) (you better not with that great kit in the panel!)
 

jbeaver

New Member
Joined
Mar 29, 2010
Messages
97
Location
San Jose, CA
Sweet, thanks!  By my calculations though, I'd be lucky to get 10 years before the battery is dead.  By then I'm sure I'd want to yank the panel and install SkyView 2!  ;D
 
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