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1. 08:43 AM - Fuse blows .... (goldpilot@aol.com)
2. 08:51 AM - Re: Fuse for strobes ()
Message 1
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Use a so-blo fuse. Quick acting fuses will open with any slight over
current surge.
David
Message 2
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| Subject: | Re: Fuse for strobes |
>A few months ago I installed Aeroflash strobes on a 79 Cheetah. Worked fine on
the ground. Worked fined in flight right up >until landing. When the fuel pump
was turned on, the fuse blew. Duplicated the problem twice. Installed a 6amp
fuse. Same >thing. Installed an 8amp fuse. Same thing. Installed a 10amp and
it holds.
>Possible scenario is that the fuel pump draws too much current. New strobes would
not be drawing too much current? Would >they?
>Last week I installed the same strobe kit on a 77 Tiger. Same exact fuse failures.
>The only real solution is to move the strobes to their own fuse/circuit breaker.
>Unless someone out there knows something I don't.
>Gary
>Sent from my iPad
Sure sounds like they have changed the strobe power requirements. How unlikely
is it that 2 planes would have the same high current fuel pump problem? Given
that the fuel pump is an interrupter design, it only draws current for an instant
when the points make contact and the electromagnet is energized. The rest
of the time the points are open and the spring is pulling the plunger to push
the fuel. And as the pumps age, the points burn and pit, eventually drawing
LESS AND LESS current, due to the resistance of the contact points rising.
I'd try the strobe power supplies individually with a small ammeter to get a reading
on the actual current draw.
Alternatively, see if you can get a "slo-blo" fuse, since the pump requires only
pulses of electricity. Could also change to a CB, which takes longer to trip
than the fuse blowing.
But I'm leaning toward strobe power supply (just one drawing too much is all it
takes) causing the problem.
--Bob Steward
Birmingham, AL
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