electrical system shuts down when keyxis pushed

[bannerpilot35]

I have a 1965 M20C. when I push the key in to start (extreme right position) the electrical,system totally dies. can reset the master and power is restored. Bad starter? is there a breaker in the master switch?

[Guitarmaster]

It doesn't return when you release the key?

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[bannerpilot35]

no I must reset the master to get power back. have checked everything when starter is hot wired it cranks slow.

[N601RX]

Its likely the master relay. You can measure the voltage on the out side of it to confirm.

[Yetti]

I vote master relay also 

[Piloto]

Weak battery. Check battery voltage at terminals. With master off voltage should be at least 12.0 volts. Also check battery connections.

José

[bannerpilot35]

Problem persists even when a jump start is used.

[Yetti]

Clean all terminals to shiny bright status. Service battery.  Check master relay. What model plane?

What kind of starter?

It could be that the starter is over drawing on amps... but not likely...

Edited March 11, 2016 by Yetti

[DrBill]

I too suspect a bad connection somewhere.  Do not forget to check ground connections too !!

To eliminate battery.   Put voltmeter directly on battery and have assistant push key in.. If voltage on battery drops below 10 it is bad.

I suspect it will stay up and you lose V on the buss due to a bad connection.

Bill