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Thruster87
Joined: 16 Apr 2008
Posts: 193
Location: Australia
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 Posted: Tue Jul 28, 2009 2:28 pm Post subject: ROCHESTER FUEL LEVEL INDICATOR WIRING |
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The indicator has 3 posts on the back marked SEN, middle not marked and IGN which goes to which.Didn't want to fry anything. Cheers Alan
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nuckolls.bob(at)aeroelect
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| Posted: Fri Jul 31, 2009 11:14 am Post subject: ROCHESTER FUEL LEVEL INDICATOR WIRING |
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At 05:28 PM 7/28/2009, you wrote:
| Quote: |
The indicator has 3 posts on the back marked SEN, middle not marked
and IGN which goes to which.Didn't want to fry anything. Cheers Alan
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Best guess is that IGN goes to your fuel gages breaker/fuse.
SEN goes to the tank sender. The unmarked goes to ground.
Bob . . .
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( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
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( -Thomas Paine 1776- )
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Thruster87
Joined: 16 Apr 2008
Posts: 193
Location: Australia
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| Posted: Thu Aug 06, 2009 10:10 pm Post subject: Re: ROCHESTER FUEL LEVEL INDICATOR WIRING |
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Still trying to get these fuel gauges to work. The sender units are 10-76 ohms and the ROCHESTER FUEL LEVEL Indicators are 0 - 90 ohms also if I apply 12v to the sen terminal and put a 45 ohm resister inline to ground on the center terminal [the center terminal has a metal plate which extends to around the light bulb hole ] it reads 1/2 way on the gauge which appears to be the correct value.Still not sure what the ign terminal is used for then !!!! Cheers Alan
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Bob McC
Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON
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| Posted: Fri Aug 07, 2009 4:54 am Post subject: ROCHESTER FUEL LEVEL INDICATOR WIRING |
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Alan;
I have no direct knowledge of these particular gauges, but in the automotive
world any terminal marked "sen" would be the sensor terminal and would be
the terminal which would be connected to your tank sending unit which would
then ground this terminal through whatever resistance resulted from the
current fuel level. i.e. this is where you would connect your "resistor to
ground" (your 45 ohm test resistor for example)
The connections you said you used for "test" support this as you've done the
same thing only backwards. (You've applied 12 Volts to ground and grounded
the power lead through your resistance. Should still read approx 1/2 scale
as your results show.)
The "ign" terminal is connected to the ignition live connection or in the
aviation world would be supplied with battery power.
The third terminal, the centre one as you call it, is ground, an hypothesis
which is supported by your information that it also seems to be supplying
the ground connection for the light.
As I said this is logic based on the automotive industry with no direct
knowledge of the specific parts you have.
Good luck
Bob McC
[quote] --
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_________________
Bob McC
Falco #908
(just starting) |
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