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Is That a Resistor Wired Between the Hot Side and the Switch Side of the Solenoid?



 
 
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  #1  
Old April 8th 04, 04:41 PM
jls
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Default Is That a Resistor Wired Between the Hot Side and the Switch Side of the Solenoid?

And what's it for? Voltage spikes maybe? It's just under the voltage
regulator on the firewall of a 1966 172, which, btw, is a wonderful flying
airplane, as I can attest from experience.

Whoever installed this device did a sloppy job because the wire was out of
the oversized terminal on the switch side. Anyway it's apparently a tiny
resistor wired to the starter switch on the solenoid and the other end of
the wire runs to the solenoid's hot terminal.

Curious.


  #2  
Old April 8th 04, 07:59 PM
John Kunkel
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" jls" wrote in message
...
And what's it for? Voltage spikes maybe? It's just under the voltage
regulator on the firewall of a 1966 172, which, btw, is a wonderful flying
airplane, as I can attest from experience.


It's a diode to prevent spiking the system when the field around the
solenoid collapses.
John


  #3  
Old April 8th 04, 10:18 PM
MikeM
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Default

jls wrote:

And what's it for? Voltage spikes maybe? It's just under the voltage
regulator on the firewall of a 1966 172, which, btw, is a wonderful flying
airplane, as I can attest from experience.

Whoever installed this device did a sloppy job because the wire was out of
the oversized terminal on the switch side. Anyway it's apparently a tiny
resistor wired to the starter switch on the solenoid and the other end of
the wire runs to the solenoid's hot terminal.


Likely a 1n4007 Silicon rectifier installed to comply with a
Cessna Service Bulletin.

It is there to suppress a voltage spike caused by the collapsing
magnetic field in the coil of the starter solenoid. This happens
just as you release the starter key switch.

There should also be one on the master (battery) solenoid. If your
aircraft has "jump start receptical", then there should be a third
one on that solenoid, too.

MikeM





  #4  
Old April 11th 04, 04:55 PM
jls
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"MikeM" wrote in message
...
jls wrote:

And what's it for? Voltage spikes maybe? It's just under the voltage
regulator on the firewall of a 1966 172, which, btw, is a wonderful

flying
airplane, as I can attest from experience.

Whoever installed this device did a sloppy job because the wire was out

of
the oversized terminal on the switch side. Anyway it's apparently a

tiny
resistor wired to the starter switch on the solenoid and the other end

of
the wire runs to the solenoid's hot terminal.


Likely a 1n4007 Silicon rectifier installed to comply with a
Cessna Service Bulletin.

It is there to suppress a voltage spike caused by the collapsing
magnetic field in the coil of the starter solenoid. This happens
just as you release the starter key switch.

There should also be one on the master (battery) solenoid. If your
aircraft has "jump start receptical", then there should be a third
one on that solenoid, too.

MikeM


Thanks to Mike and the others who responded to my questions about the
rectifier and leaky struts, making this newsgroup (and also because of so
many knowledgeable of courteous people here) a pleasure to visit.


 




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