jabbahutt
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 posted on 23/1/09 at 01:52 PM |
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ford speedo sensor swiring alternatives
Right need some help
checked last night and as thought the gauge send about 2.5V to the speedo sensor rather than the other way around.
as the ford speedo sensoe from Burton part umber REVFSS has 3 wires, 1x12V, 1 earth and a wire to the gauge can I wire this up so instead it just
allows the 12v from the gauge to aerth as the sensor rotates?
any help much appreciated
Nigel
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02GF74
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| posted on 23/1/09 at 02:32 PM |
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quote:
Originally posted by jabbahutt
checked last night and as thought the gauge send about 2.5V to the speedo sensor rather than the other way around.
I bet you used DVM to measure that; all you can say is the voltage is 2.5 V - without seeing the circuit, it is pure speculation as
to whether that is an output or input.
If could be an output that is grounded by the sender to work with a reed switch or it could be bias on an input stage.
as the ford speedo sensor from Burton part umber REVFSS has 3 wires, 1x12V, 1 earth and a wire to the gauge can I wire this up so instead it just
allows the 12v from the gauge to aerth as the sensor rotates?
The 12 V to the sender comes from switched igniton - your speedo will have similar connection so take the 12 V from same place. Likewise
with 0 V.
The output from the sender will go to the input of the speedo but at this stage since there is insufficient data, it is not possible to say that it
will work as the signal may need to be conditioned to give a different voltage.
Do you have any info. for the speedo?
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jabbahutt
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| posted on 23/1/09 at 03:37 PM |
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i've just emailed Stewart Warner in the States to ask whether the gauge supplies or receives voltage from the switch set up.
Hopefully then I'll be in a better position to make a decision
Cheers again for the time and assistance.
Nigel
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ss1turbo
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| posted on 28/2/09 at 09:59 AM |
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Any follow up on this - as i wanted to feed my Ford MT75 sensor straight into an Acewell unit..suppose i could always try and juice it up and see...
Long live RWD...
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smac
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| posted on 1/3/09 at 05:18 PM |
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I too am trying an MT 75 to acewell. The three wires to the hall sensor are black - 12v, brown -earth and yellow signal. Ive tried it with the 6
volts the acewell outputs and it doesnt work. Im reluctant to used 12vs into the Acewell as it is configured for 6. I have read elsewhere that a
resistor bridge (whatever that is) can be used to reduce the voltage to a level acceptable to the acewell but I can find no further details. After
that it will be a case of trying to work out how often the hall sensor pulses per rotation of the gearbox output.
[Edited on 1/3/09 by smac]
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smac
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| posted on 2/3/09 at 07:16 PM |
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Ive now got the Acewell to recognise the signal. I took the yellow signal wire through a LM7805 voltage regulator (90p from maplins) which gets it to
5 volts. I still havent worked out how many pulses it makes but ill think of a way.
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ss1turbo
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| posted on 2/3/09 at 11:23 PM |
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I guess that means you could also do it with either dropper resistors or a zener circuit...result!
At higher pulse frequencis, i could see the 7805 causing hold-up issues..
Long live RWD...
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