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1. 12:22 PM - Blowing fuses on B&C BC433 alternator (Sam Hoskins)
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| Subject: | Blowing fuses on B&C BC433 alternator |
Hello all. I haven't been on this list for some time, but now could use a
bit of advice.
I have a Quickie Q-200 <http://samhoskins.blogspot.com/>, sporting a hopped
up O-200. Pistons, RWS electronic fuel injection and electronic ignition.
It takes around 15 amps to stay in the air, between the fuel injectors,
spark plug coil and fuel pumps, it requires a lot of juice. All this was
wired up while attempting to follow Bob's best practices.
The B&C 433 alternator
<https://bandc.com/product/alternator-30-amps-homebuilt-less-gear/> has
three legs for output and they go to their proprietary voltage regulator.
Each leg has a 20 amp in-line fuse before connecting to the regulator. Here
is the BC433 wiring diagram
<https://bandc.com/wp-content/uploads/2018/05/505-500_revJ.pdf>.
About 50 flight hours ago, one of the fuses blew. Really blew, it partially
melted the plastic coating. I couldn't really find anything wrong, but I
thought possibly there was a short from one of the butt connectors to the
firewall, nothing definitive though. Last week, 50 flight hours later,
another fuse blew. I don't know if it was on the same leg as I didn't
record it the first time it happened. All the wiring from the alternator to
the VR seems to be 100%. I put my VOM on the leads and they all checked
out per the B&C service manual.
https://bandc.com/wp-content/uploads/2018/05/pmr3a-trouble.pdf
I called B&C and talked to TJ. We went over what I had done, but he didn't
really have a solid suggestion, other than pulling the engine (big bad job)
and pulling the alternator off and sending it in. He did suggest that I put
a meter on the leg that blew the fuse and rotate the prop, but it showed
nothing. After I put everything together I ran the engine and everything
seemed to be fine.
I thought I'd run it by the brain trust and see if there were any other
root cause suggestions.
Thanks.
Sam
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