Matronics Email Lists

Thanks for taking time to look into this. It may work, though it is looking like I'll need an avionics shop with old manuals to derive an actual pin out from the King radio to the Narco indicator. Se ...

I happen to have a Narco ID-825 indicator that can display VOR/LOC/Glideslope. I can't find and technical info on it. Can anyone tell me if this indicator contains an internal VOR/LOC "converter& ...

I think the first thing I would do is to connect a temporary extension wire from the field wire going directly into the alternator into the cabin/cockpit so that you can measure the field Volts. If th ...

Bob N. and others...Thanks for your comments. I did replace the high milliOhm battery contactor with a new Cole-Hersee unit. I also replaced for good measure the battery master switch since the origin ...

The master relay was not hot at all. In fact, Amp draw was in spec, <1A. I do believe the problem is corroded contacts. It was probably in there for 35 years.
I have ordered a new (but different) ...

I've been chasing a sporadic in-flight alternator drop out issue in my LongEz. (No engine starting or dead battery issues.) The alternator was checked out to be fine and the voltage regulator is fairl ...

Yeah, I had a Zeftronics unit in my C172 and was very happy with it. Good customer support, too. However, the question really remains...is this $180 unit really that much better than the $25 legacy Fo ...

Are the Ford electromechanical voltage regulators (e.g., VR749) so much inferior to the newer Solid State (electronic) voltage regulators? What is a generic solid state unit equivalent to the Ford gen ...

Ok, I was worried there for a while thinking that either I burned up my starter solenoid contacts and/or that it was mounted upside down. Like I said in my original post, now that battery voltage is n ...

Recently my battery fell below 11 volts and so it could not provide enough power to completely turn over my engine. What surprised me more than the low battery was that after switching off my master a ...

Hmmm. I was about to look more deeply into the circuitry when frustration truly hit (the radio). Hit it with a bigger hammer, as they say. Well thinking there might be a relay somewhere in the unit, I ...

I've been troubleshooting my intercom system and radio operation and eventually found one of the mic jacks had tangs that were bent and touching. After unbending the tangs, the intercom system worked ...

The extension (thermocouple) wire pair would eventually connect to an instrument on the panel in the cabin. So, Engine side: thermocouple--spades--J wire pair extension--thru firewall. Then Cabin side ...

Bob, thanks for your reply. You asked what the spade terminals were attached to. They are crimped on to the J wires of the thermocouple sensor. The wires are red and white and one of them was magnetic ...

I think I understand how to do things right with thermocouples, but want to make sure. I have a set of (GRT/EIS) J- type, CHT bayonet thermocouples. The 2 foot leads are terminated from the factory in ...

Ok, I'll try out another shumacher. I just picked up the "Speed Charge" name from the shumacher website (SC series). I'll see what I find at wall mart or autozone.

Hi Bob K.,

I sent the unit to you quite sometime ago maybe spring 2010...I can't recall more exactly. You acknowledged receipt, but I think it was just prior to your workshop move/reorganization. Y ...

A while ago I purchased a Shumacher 1562A (not the original 1562) battery minder. I forget the details, but it did not seem to be supplying the correct voltages. I sent it to Bob K. for investigation, ...

Bob, Thanks for taking the time to look at the schematic. I guess you're right and that I should just implement a relay. I was hoping to avoid yet another device, but it is probably the path of least ...

The Intercom is an RST 442B. Old stuff, but it works well and I can't afford a replacement right now. So, I'm planning to install it as a permanent intercom and am trying to hardwire the "portabl ...