. . .
The attached reference article is EXCELLENT and explains fuses.
DO NOT USE the smaller 1/4 inch fuses, they can cause shorting out, and electrical problems, etc. When I bought my plane ALL fuses were automotive wrong size and incorrect rating.
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It's not clear to me how fuses can cause "shorting out" since they're in series with the circuit, or other electrical problems. The referenced article states:
More good news is that the much
more common fuses which are 1/4” in diameter and 1-1/4” in length is that they can be used in your
existing fuse holders and in the new replacement fuseholders. Those fuses are best known as AGC type
and you can find them in every auto parts store if they still sell parts for American cars.
That's been my experience -- I've used standard 1/4" diameter fuses in several positions in my airplane for more than a decade and 2000 hours of flying without any electrical or other problems. The author of the article shows a fuseholder type which might allow the smaller fuse to go deeper into the holder which would cause a problem, but it wasn't apparent to me if that was the case. When I put a 1/4 inch fuse into the holders in my 150G, I have to push to compress a spring, so I know that there's good contact at both ends of the fuse. The only potential problem I can see is if the current is close to the fuse rating, the fuse might blow at a slightly lower current since the heat might not be conducted away quite as well from the smaller caps of the 1/4 inch fuse than the larger one. But none of the fuses in my plane are running anywhere near their rated currents because the avionics and lights have been replaced by units requiring much less current.
I'd appreciate any explanation of exactly how a 1/4 inch fuse causes "electrical problems" or from anyone who has experienced such a problem that was definitely caused by using a 1/4 inch fuse in their 150.
Roy
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