Hangar Flying

Help ! !   I bought a used  HSI / NAV  unit from a guy in Florida.  I finally got it hooked up (all the pin-out wires in the right places ), but when I push the Marker Beacon test switch to test the lights, they don't work.  The common wire that goes to all three lights carries the current and the light fixtures are in plastic tubes so they "float" and are not grounded.  When I put a meter to the cases it reads 7 volts and when I push the test switch it drops to zero.  Everything else on the radio seems to work, but I can't make the lights work.  I took the center wire off each light and ran a jumper from ground and then they light up ( but very dimly ).  The bulbs are all fine.  I'm stuck ! !   Any ideas ?   This is a Narco 124 TSO unit.  About 1977 vintage.  I have the manuals but don't know what else to try.

Anybody got any ideas ?   Email me at  EZskyboy@hughes.net

Thanks,

Glennbob

EZCHERRY,

Would it be as simple as setting something up with the local FBO ?   Graham Aviation ?  I'm  not in Ohio, . .but perhaps we could do the communications for you.   There are some members in Ohio that may be able to do this better than I but I'd like to help if this is all you need.

Glennbob

Waiter,   If the fan doesn't work for the heat application, . . . shoot . . .you could always use it on my sailboat ! ! !    =   )

Glennbob

Waiter,

I figured out how to wire the switch.  What I needed to know was where to get the switch.  Thanks for the link ! !   That helps alot ! !

Glennbob

Hey,

Glennbob here.  I'm planning oil heat too.  I plan to put the second oil cooler under the thigh support for the rear passenger, although the hell hole does seem like a viable option.  I don't think you need a 10 amp breaker for the blower though.  If you can find out how many watts a given blower fan draws, you can more accurately acertain the proper amperage draw. Go to :  http://www.csgnetwork.com/ohmslaw.html   This link will give you the formula.  You just plug in the numbers and it will give you the correct amperage draw. 10 amps seems a little excessive to me, although I'm just shooting from the hip. I haven't actually looked at this.  One way to tell is to peruse the junk yard and look at the fuse panels on different cars.  The fuse panel usually lists the amperage for the heater blower motor.  

Also, be sure to close every possible nook and cranny that leaks in the front of the plane, especially where the elelvator control tubes enter the fuselage.  This will go far to keeping you warm.    

Warm regards,  Glennbob

I saw a 90 amp Toyota alternator with an internal regulator on Ebay a while back.  The price as I recal was quite resonable.  I'm not sure if it's still available.

Glennbob

The best way to find out is to check with E.I.  !   They should be able to tell you.  Of course they'll want to sell you theirs, but you could just order the head and hook your probes up to the unit and do a test.  Get a soup can, fill 1/2 full with vegetable oil, and put your probe in and get a good quality candy thermometer from the grocery store.  Take a torch and heat up the soup can and read the thermometer.  Check what the head is reading.  Then you can either,  if it's close, make note of how much and which way,  or if it's way off,  order the probes from E. I.  They're not that much.  I think we're talking about maybe $10.00 each ?  Carefull with that hot oil though.  Easily start a fire !

Glennbob

P.S. (glennbob here again). If you'd like, send me an email at  ezskyboy@hughes.net, and I'll send you some pics of mine.

Glennbob