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#1
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What size fuse for Cessna Clock?
Does anyone know what size fuse is used in the clock circuit in a 172H.
This fuse is located in a holder by the battery box. POH only shows fuse and no ampere rating. I would guess 1 or 2 amp?? Thanks, Mark |
#2
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Mark Martindale wrote:
Does anyone know what size fuse is used in the clock circuit in a 172H. This fuse is located in a holder by the battery box. POH only shows fuse and no ampere rating. I would guess 1 or 2 amp?? The last time I had to replace one, it was something ridiculous like a tenth of an amp. George Patterson There's plenty of room for all of God's creatures. Right next to the mashed potatoes. |
#3
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My service manual for the C172, 1969 through 1976 models,
indicates in the electrical load anaylsis tables that the clock is negligible. The smallest load listed in the table is 0.33 amps so the clock is smaller than that. The manual does not provide the fuse size as far as I can tell. My guess would be 1/4 amp for the fuse. "Mark Martindale" wrote in message ... Does anyone know what size fuse is used in the clock circuit in a 172H. This fuse is located in a holder by the battery box. POH only shows fuse and no ampere rating. I would guess 1 or 2 amp?? Thanks, Mark |
#4
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I suggest 1 Amp as the OEM clock is an occasional very short but sharp
current pulse type of load. Certainly the wiring to the clock can take 1 amp without smoking anything but the fuse. If you put in a smaller fuse, they may fail after a while. |
#5
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Will you all please put this person in your "watch" before "kill" file.
This is absolutely bogus information. Jim "nrp" wrote in message oups.com... I suggest 1 Amp as the OEM clock is an occasional very short but sharp current pulse type of load. Certainly the wiring to the clock can take 1 amp without smoking anything but the fuse. If you put in a smaller fuse, they may fail after a while. |
#6
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nrp wrote:
I suggest 1 Amp as the OEM clock is an occasional very short but sharp current pulse type of load. Say what? It's got a little motor in it. Current draw is constant. George Patterson There's plenty of room for all of God's creatures. Right next to the mashed potatoes. |
#7
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You must have a different clock than I have. Mine is the OEM (still
running after 30 years!) that has the rewinding clunk every 5 minutes or so. Like they once used in cars 40 years ago. |
#8
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"George Patterson" wrote in message news:zxNee.56$Dn.52@trndny02... nrp wrote: I suggest 1 Amp as the OEM clock is an occasional very short but sharp current pulse type of load. Say what? It's got a little motor in it. Current draw is constant. George Patterson There's plenty of room for all of God's creatures. Right next to the mashed potatoes. I just replaced one of those fuses on a 172 from the sixties. It was under the cowl, near the battery, something like 1 or 2 amps, and the POH stated the fuse was for the clock. A new fuse never helped the clock to work, though. It's still deader'n 4 o'clock. Those old clocks are cute but don't last. |
#9
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nrp wrote:
You must have a different clock than I have. Mine is the OEM (still running after 30 years!) that has the rewinding clunk every 5 minutes or so. Like they once used in cars 40 years ago. Thanks for the replies. My clock is like nrp's and has the rewinding solenoid that clunks about every 2 minutes. There is only a load on it for a fraction of a second and is too fast to measure with my dmm. I am going to put a 1 amp fuse in and see what happens. Thanks, Mark |
#10
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Mark Martindale wrote:
Thanks for the replies. My clock is like nrp's and has the rewinding solenoid that clunks about every 2 minutes. There is only a load on it for a fraction of a second and is too fast to measure with my dmm. I am going to put a 1 amp fuse in and see what happens. Mark, The Cessna part # for the fuse is an S1091-1. This is a 1 amp *rated* fuse. The physical *size*, however, is a little different than your standard automotive "AGC" glass fuse. The length is the same, but the diameter is slightly larger. These are called "AGS", and if your local NAPA doesn't have them, your local Cessna dealer will (they are pretty inexpensive". Happy Flying! Scott Skylane N92054 |
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