Today's Message Index:
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1. 05:38 PM - Alternator Field Failure? (farmrjohn)
2. 07:20 PM - Re: Alternator Field Failure? (Robert L. Nuckolls, III)
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| Subject: | Alternator Field Failure? |
I have an O200 with a TCM 633661 alternator and Zeftronics R15V00 Rev. A regulator.
On my last flight charging to the bus/battery stopped. After replacing
the regulator with a know good one and still no charging I started to follow the
Zeftronic installation/trouble shooting instructions. Checking the resistance
for the field resulted in infinite resistance from the field terminal to ground
whereas the instructions indicated 3.5-6 ohm is normal resistance. I'm
assuming this would indicate a break in the field wiring and hence no charging
or could the problem be something else?. If so, is this repairable? Are there
alternative alternators (certificated airplane) if replacement is necessary?
Thanks, John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505569#505569
Message 2
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| Subject: | Re: Alternator Field Failure? |
At 07:37 PM 1/2/2022, you wrote:
>
>I have an O200 with a TCM 633661 alternator and Zeftronics R15V00
>Rev. A regulator. On my last flight charging to the bus/battery
>stopped. After replacing the regulator with a know good one and
>still no charging I started to follow the Zeftronic
>installation/trouble shooting instructions. Checking the resistance
>for the field resulted in infinite resistance from the field
>terminal to ground whereas the instructions indicated 3.5-6 ohm is
>normal resistance. I'm assuming this would indicate a break in the
>field wiring and hence no charging or could the problem be something
>else?. If so, is this repairable? Are there alternative alternators
>(certificated airplane) if replacement is necessary? Thanks, John
>
There are carbon brushes that ride on slip
rings to conduct output from the regulator to
the moving field coil. These are a service-life
limited part . . . they wear out.
Since this is a TC aircraft, regs require
service by a 'qualified' facility. But if
you're adventuresome, you could disassemble
it for inspection and see what the brushes
look like.
A spec-rebuilt alternator is breathtakingly
expensive . . . over $1500
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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