Some electrical equipment on WITHOUT the master switch ON?

cessnadriver · #1 12-22-17, 05:12 PM

JAG-Many thanks for the assistance! I look forward to hearing from you again. ALSO I see you're in Texas-where? I went to High school in Ft, Worth, TX, many decades ago!
BILLS

JAG · #2 12-23-17, 10:47 AM

Bill,

Here is a snap shot of your wiring diagram. Is this how it was wired before - or does this reflect how you have moved the generator wire now to the other side? The four posts on the older solenoid, was simply a way to get the standby power to the system when the master was off - solenoid relaxed.

This is a very strange problem - then again, electrical issues are always a challenge. Are you able to check to make sure the diode on the positive side of the solenoid is working?

Jeff

JAG · #3 12-23-17, 10:56 AM

Bill,

Yes, if you move the generator fuse wire to the downstream side of the master solenoid, it will impact the standby/run system, as it will no longer be connected directly to the battery. For this system to work right, it needs to be direct to the battery (should you ever require it).

I am located in Houston, Texas. My aircraft are based at Fair Weather Field, TX42, just west of Houston.

Jeff

cessnadriver · #4 12-23-17, 03:30 PM

JAG. Yes my solenoid WAS wired the way the schematic shows. So IF the diode is bad do you think that's how the power is getting through? How is the diode checked? I'm thinking there is a special selection on a Multi-meter??
Many thanks, Happy Holidays.
BILLS

JAG · #5 01-02-18, 02:30 PM

Bill,
Somehow, you are creating a ground with your lead tester, and if that diode is bad, it could be closing the solenoid. I am having a difficult time though now that you tell me yours was wired properly in the first place...

Yes, a good multi-meter will have a diode checking capability. The setting usually has a symbol of a diode - and you use that to check to see if it is working properly.

Jeff

cessnadriver · #6 01-03-18, 02:23 PM

JAG. Thanks for the reply. My multi-meter does not have a diode tester but I did see on Youtube that a diode can be checked using the Ohm (resistance) selector on the meter, it shows resistance on one side and when the leads switched there will be no resistance. I think it's the diode going into the master switch that maybe the problem although I haven't had a chance to do the test. ITS VERY COLD HERE IN PENNSYLVANIA!! I'll let you when I do the test on the two diodes-let hope! BILLS

cessnadriver · #7 01-08-18, 10:15 AM

JAG. I took the diodes from my PARTS Skymaster, it was fairly simple, someone mentioned going through the Avionics cover and the diodes are on a plate of phenolic screwed to one of the massive stunts forward of the hydraulic power pack. I checked the diodes using my multi-meter okay! Now I'm waiting for somewhat warmer temperatures outside to check the diodes on my flying Skymaster. LETS HOPE IT IS INDEED ONE OF THOSE DIODES! I'll let you know what I find-REGARDS- BILLS