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Kuntzleman Strobe Failure

Posted By:
Thomas Muller
Homebuilder or Craftsman
#1 Posted: 1/31/2010 09:42:04

Please forgive me if this is a duplicate post; I tried to put it up yesterday and cannot find it.

I built and RV-9A with three Kuntzleman strobes that has been flying about 2-1/2 years.  Three times during that period, the strobes failed completely.  There was power to the pack, but no high voltage out.  The first two times, I returned the pack to the factory and they either replaced an internal fuse or the entire board.  I just removed the pack for the third time and it is exhibiting the same symptoms.  My patience is wearing thin with this and, I assume so is Dick Kuntzleman's.  I want to get an idea of what is wrong before I put the system back together.

It could be something in my wiring.  The most likely culprit is water in the multiplug at one of the wing roots, although it could also be a bad ground or a bad strobe unit.  Before I tear the wiring apart for a problem that my not exist, I want to get an idea what's wrong.  It has recently been recommended that I put dielectric grease in the connectors to keep water out and I intend to do so, but not for a couple months until it is warm enough to work on the airplane for several hours.

Is is possible that the Kuntzleman system, which was designed for ultralites, is not robust enough for a cross country airplane that does missions of 4+ hours with the strobes running?  I am considering replacing the power pack only with one from Strobes n More, probably their Pro Series 606, but I am not positive the high voltage side is electrically compatible.  One thing I like is having an external fuse so that if it blows it won't have to go back to the factory.

Anny suggestions or personal experiences?

Dan Miller
#2 Posted: 2/5/2010 07:47:14

Why not consider a set of lights that are warranted for the life of the aircraft, are waterproof, are shock proof, and require no external power supply?  Look at:  www.aveoengineering.com

Dan Miller

Aveo, SE


Bill Canino
Homebuilder or Craftsman
#3 Posted: 2/5/2010 14:34:24


We have installed more than 80 sets of Kuntzleman strobes on our aircaft. He has always fixed any issue and we will order from him again. Not sure about water but you  will lose the power box if you apply voltage to the switch and the strobes are not attached. Maybe you are having a wire connection issue. That would create the same problem you describle.