sprouts-car
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| posted on 19/8/09 at 08:27 AM |
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Speedo trigger switch
When i bought my second hand speedo it didnt come with one of those input sensors. Presumably its just a small coil which generates a pulse when the
magnet goes past?
Do maplin's sell anything which would work?
I'm buying something else on there and thought i would be nicer to share the delivery cost.
Can anyone help?
Chris
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BenB
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| posted on 19/8/09 at 08:30 AM |
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Ideally you want to know what signal the speedo is expecting. There are lots of different types-
Reed relay
Hall effect
Variable reluctance
1 and 2 supply quite big signals whilst 3 supplies signals in the millivolt range. If its expecting 1 or 2 and you give it 3 it just won't work,
if it's got a big amplifer on the input stage (ie expecting a VR signal) and you give it full voltage the amplifier might start complaining...
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sprouts-car
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| posted on 19/8/09 at 08:38 AM |
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If you can tell from a picture, then it's one of these:
Picture
Thanks
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t16turbotone
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| posted on 19/8/09 at 08:47 AM |
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that looks the same as mine, input on mine is via a 12vdc 3 wire proximity switch. Maybe i can find data sheet if you need it....send u2u if u do
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BenB
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| posted on 19/8/09 at 08:51 AM |
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If it is 3 wire then it's very likely to be hall effect / proximity. Are the connectors on the back of the dial at all useful?
Often there will be 2 pins for lighting and then either 2 or 3 for the speedo.
[Edited on 19/8/09 by BenB]
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sprouts-car
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| posted on 19/8/09 at 08:52 AM |
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quote:
Originally posted by BenB
If it is 3 wire then it's very likely to be hall effect / proximity. Are the connectors on the back of the dial at all useful?
Often there will be 2 pins for lighting and then either 2 or 3 for the speedo.
[Edited on 19/8/09 by BenB]
Its got a single input wire. (well two if you include earth).
[Edited on 19/8/09 by sprouts-car]
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