Location of diodes in the Alternator Restart system?

[wslade2]

Here’s some interesting reading:

http://www.electronicsplanet.ch/en/e...-in-series.php

In short, don’t bypass the resistor, it protects the diode

[Rick Erwin]

wslade2,

Thank you for posting the article.

Jumping around the resistor was one of my options if I couldn't get the system to work, but thankfully it now works as designed. It's actually a pretty cool system. Hopefully, it will never be needed.

Rick

[patrolpilot]

My airplane has the restart switch installed, but nothing is coming off it. A previous owner must have removed everything. I have the updated battery pack Kit, but I cannot find a wiring diagram with components. Can anybody help me figure out what is needed to get this completed?

I spoke with Don Neiser, he has the switches, but he hasn't gotten back to me with a diagram or material list.

I discovered my pack was missing the first time I did the 25 hour checks of the electrical system. I assumed the batteries in the pack needed replacing, which went several months up to the annual. Three annuals later, I'm still trying to get this done. No one wants to touch it. A metal panel is being installed in this third annual, and it needs to be completed.

I have used the restart in another Skymaster I flew on pipeline patrol. I consider it an airworthiness item based on that experience, and that there is both the pilot performed interval test in the POH and emergency checklist. Honestly, had this been caught on the pre-buy, I would not have bought the airplane.

[Rick Erwin]

PatrolPilot: The Alternator Restart System is pretty simple. I rebuilt mine from the ground up.

I've attached a highlighted shot of the schematic showing the system. This schematic shot is from plate E22.

If I'm remembering correctly, you have a G model, you still have the installed switch, and you already have the Service Kit that gives you the 4 C-cell battery pack. You just need the:

• Resistor, (#9) and the
• Two diodes (#12)

Plate E19 shows the:
Resistor to be a 12 ohm, 1 watt resistor, and
Diodes to be an F4, which was superseded to 1N2070. Both are readily available from eBay and Amazon.

Getting to the parts on my P model was a PITA though. I don't recall if you have a P though. The stuff lives above the pressurization panel behind the behind the switch.

Rick

[patrolpilot]

Thanks, Rick, I owe you. My mechanic and avionics guy gave a sigh of relief as well.

[Rick Erwin]

I'm glad I could help.

Rick