tilly819
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| posted on 21/2/11 at 04:09 PM |
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Koso RX1N Fuel Level on Blackbird Sender
Hi all
I have been installing a koso RX1N on my roadster and everything is working fine except the fuel level
Honda Blackbird Sender has 3 wires green, grey, brown
dash has one wire called (green/fuel-)
I can only make the display reed full all the time or empty all the time
I have followed the instructions in the manual for setting up the Ohm range and that appears to be fine
Also the sender and adjoining wires are fine since it worked fine with the original blackbird clocks that i have removed.
Any ideals?
Thanks Tilly
F20C Haynes roadster 440 BHP/Tonne www.youtube.com/handmadeextreme
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YQUSTA
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| posted on 21/2/11 at 05:17 PM |
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take a resistance reading between each of the wires.
You will need to do this with the sender in open and closed settings.
once you have found the earth/negative connect one of the others to your RX1n. see how it works without the sender in the tank If it works the wrong
way round try the other wire from the sender.
If you are still having trouble I can take the boot out of my car and tell you the colours.
One other thing to be careful of is that the sender isn't grounding to the tank.
Took me a while to work out why the guage was showing full all the time when in the tank (after I had run out of fuel  )
what I had to do was make sure the sender and the bolts used to hold it to the tank didn't touch.
Hope that helps a little.
[Edited on 21/2/11 by YQUSTA]
"If in doubt flat out"
Colin McRae
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tilly819
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| posted on 21/2/11 at 05:32 PM |
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ok cheers that sounds easy enough, i have been doing it assuming that the sender gets its ground as a frame ground from the sender flange on the tank
(make sense?) so have just tryed connecting the 3 wires in turn to the rx1n. so what you are saying is that one of the other wires is a ground for the
sender? that would make sense to me
tilly
F20C Haynes roadster 440 BHP/Tonne www.youtube.com/handmadeextreme
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Thurbs
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| posted on 21/2/11 at 05:32 PM |
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I found with my blackbird sender with my koso clocks the gauge read backwards so I had to switch the wires round on the coil inside the sender, quiet
a fiddler job
Can't remember wiring off hand but can check it when I'm home on Thursday.
Cheers
Andy
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YQUSTA
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| posted on 21/2/11 at 05:43 PM |
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quote:
Originally posted by tilly819
ok cheers that sounds easy enough, i have been doing it assuming that the sender gets its ground as a frame ground from the sender flange on the tank
(make sense?) so have just tryed connecting the 3 wires in turn to the rx1n. so what you are saying is that one of the other wires is a ground for the
sender? that would make sense to me
tilly
Sounds like you have the same problem I had.
Best to take the sender out the tank to setup.
Yes one of the wires is earth/neutral.
one of the others will make the fuel guage show corectly and the other will make it work in reverse.
I had to do a bit of bending on mine to get it to work correctly when in the tank as I wanted it to show empty when I had around quarter of a tank
left.
"If in doubt flat out"
Colin McRae
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tilly819
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| posted on 21/2/11 at 05:49 PM |
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yeh iv done the "bending" already i had it working on the origonal blackbird clocks for a few months in the car but it must get its earth
from the clocks, il have to just measure it like you say then take one of the wires to earth then the other to the RX1N
might try it tomorrow night
thanks for the help
tilly
F20C Haynes roadster 440 BHP/Tonne www.youtube.com/handmadeextreme
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YQUSTA
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| posted on 22/2/11 at 06:39 PM |
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Had another think about this.
You have 3 wires on the sender but only 2 will show a difference in resistance when the float is moved. These are the 2 you need the third isn't
required.
Connect 1 of the wires to the KOSO and one to ground and job should be done, if the KOSO reads backwards just reverse the wires and it should correct
the problem.
Not sure why I have thought of this so info in previous posts maybe correct but it gives you another angle should the other ideas fail.
"If in doubt flat out"
Colin McRae
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Thurbs
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| posted on 23/2/11 at 02:29 PM |
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Thats what I found with only two cables connected, didn't matter which way you have them around it's resistence not polarity, reversing
them makes no difference. I found it read the wrong around for my koso gauge which is why i had to switch the wires around on the variable resistor
inside the fuel sender.
I think i read somewhere that the blackbird sender fits on the bottom of the bike tank so when it's fully extended i.e floating in the bike tank
it's showing full, but when fitted to a car tank in the top fully extended is empty.
Hope this makes some sense but it's defo working ok on mine.
[Edited on 23/2/11 by Thurbs]
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