1973 C150L Over voltage...

1973 C150L Over voltage...

<HTML>Hello everyone,

I own a 1973 Cessna 150 L, and for some time now, I have been having intermittent problems with an 'Over Voltage' warning, and charging problem. When I turn on both the Master switch and Battery switch, usually the over voltage light does not come on, and some times it does. Once the engine is running and the system is under load (radio, beacon) the light will stay on, and the ammeter will indicate negative. If I cycle the master, it will extinguish, and the system will charge. On a second note, it almost appears to be heat sensitive. The colder, the more stubborn. The other day, I flew a half hour, and I could not trip it to charge. However, on final, I gave it another try, and it started to charge.

I was wondering what might cause this. Is it the voltage regulator, or the over voltage sensor? What needs to be replaced? Is it a common problem?

Any comments or suggestions would be greatly appreciated.

Thanks,

Jason pinkney.</HTML>

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Re: 1973 C150L Over voltage...

<HTML>I am not A&P but I am a electrician. I belive I would have the alternater checked.
The discharge and over voltage problems could occur at diffrent times with a
bad winding.</HTML>

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Re: 1973 C150L Over voltage...

<HTML>To begin with,Id check(with a digital meter)IF you actually have an over voltage problem,or just an indicator problem.Monitor the B+ with a digital Voltmeter connected to possibly a cigar lighter output,or Avionics master...leave it hooked up,and set in the RH seat(or have someone hold it)...go zoomin,and have an observer look at the meter..If youre a 150,you should typically see no more than about 14 volts max at any given time(and THAT voltage should be right after cranking,and at around 1800 RPM)....IF the meter doesent go any higher than the 14VDC +/- a volt,Id suspect youre Overvoltage Indicator circuit is faulty.
IF Im not mistaken this circuit is controlled by a diode,that conducts over a set voltage,and turns on an indicator...IF this diode is leaky(electronically speaking) it will be sensitive to heat/cold,and conduct erratically causing youre"Indication".
IF this is found to be the problem,they can be acquired fairly cheaply(I suspect itll be a 14v/2A zener).....</HTML>

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Re: 1973 C150L Over voltage...

<HTML>You could also have a possible bad Alternator Circuit breaker. or the overvoltage relay. If it is anything like my 73 Cardinal has the relay can go bad. There is also a zefftronics voltage regulator available with the over voltage relay built in. As for the CB there was a Service letter in 1976 SE76-15 ref service kit SK150-46 which i think was later rev to SK150-46D.</HTML>

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