IH Farms 2 Posted December 29, 2019 Share Posted December 29, 2019 Can anyone tell me how the 2 wire sensors should be wired? One is a signal wire I assume should the other one be grounded or powered? I had to change the trans in my superliner before Thanksgiving and the used trans i found has a speed sensor would like to get my speedometer working again. Have an autometer electronic guage installed already Quote Link to comment https://www.bigmacktrucks.com/topic/60331-mack-speed-sensor/ Share on other sites More sharing options...
Rob Posted December 29, 2019 Share Posted December 29, 2019 (edited) Just a guess as I really know nothing about these but "usually" there are two wires; one will have a tracer on it which is usually white and this is the signal wire to input into the "IN" jack on an electronic instrument. The other wire should be a single color and can be grounded to either the chassis, or to the transmission housing itself. I would at a minimum ground to the sheet metal of the cab and housing both, to ensure it is grounded and stays that way. No power applied in this application as it goes directly to the instrument. Edited December 29, 2019 by Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/60331-mack-speed-sensor/#findComment-439042 Share on other sites More sharing options...
IH Farms 2 Posted December 30, 2019 Author Share Posted December 30, 2019 Ok I'll try that. The signal generator I had on the cable drive was a 3 wire so it had power, ground and signal Quote Link to comment https://www.bigmacktrucks.com/topic/60331-mack-speed-sensor/#findComment-439063 Share on other sites More sharing options...
Rob Posted December 30, 2019 Share Posted December 30, 2019 1 hour ago, IH Farms 2 said: Ok I'll try that. The signal generator I had on the cable drive was a 3 wire so it had power, ground and signal Most aftermarket instruments have the power supply built in. You are basically shifting the ground and triggering the instrument on the decay edge of the generated pulse train. On the rear of the instrument there should be a selection of dip switches, (dual inline package) which are off/on selection. You will need to fine tune these switch selections which are binary weighted in delay to make your traveled distance display one statute mile for a statute mile you drive. The mile markers alongside the interstates are real good with this unless you happen to have a pulse generator, or pulse counter readily available as then calibration can be performed on a bench. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/60331-mack-speed-sensor/#findComment-439069 Share on other sites More sharing options...
41chevy Posted December 30, 2019 Share Posted December 30, 2019 Also there are speedometer apps for your phone that are extremely accurate to clock both speed and distance via GPS Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/60331-mack-speed-sensor/#findComment-439083 Share on other sites More sharing options...
IH Farms 2 Posted December 31, 2019 Author Share Posted December 31, 2019 20 hours ago, Rob said: Most aftermarket instruments have the power supply built in. You are basically shifting the ground and triggering the instrument on the decay edge of the generated pulse train. On the rear of the instrument there should be a selection of dip switches, (dual inline package) which are off/on selection. You will need to fine tune these switch selections which are binary weighted in delay to make your traveled distance display one statute mile for a statute mile you drive. The mile markers alongside the interstates are real good with this unless you happen to have a pulse generator, or pulse counter readily available as then calibration can be performed on a bench. This one is pretty easy to calibrate hold the trip reset turn key on guage goes into calibration mode. Use a predetermined 2miles press the reset again drive the 2 miles then hit it again at the end Quote Link to comment https://www.bigmacktrucks.com/topic/60331-mack-speed-sensor/#findComment-439094 Share on other sites More sharing options...
IH Farms 2 Posted December 31, 2019 Author Share Posted December 31, 2019 5 hours ago, 41chevy said: Also there are speedometer apps for your phone that are extremely accurate to clock both speed and distance via GPS I have a gps but seeing as the cop that did a level 1 inspection on me asked if it worked last year thinking it should work. Plus I like tracking miles for mpg and miles in different states ect since I have apportioned plates on it Quote Link to comment https://www.bigmacktrucks.com/topic/60331-mack-speed-sensor/#findComment-439095 Share on other sites More sharing options...
41chevy Posted December 31, 2019 Share Posted December 31, 2019 (edited) 3 hours ago, IH Farms 2 said: I have a gps but seeing as the cop that did a level 1 inspection on me asked if it worked last year thinking it should work. Plus I like tracking miles for mpg and miles in different states ect since I have apportioned plates on it You can use the gps or speedo phone app to set the dip switches on your new speedo. But I see with your set up all you need is an accurate mileage reference. Edited December 31, 2019 by 41chevy Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/60331-mack-speed-sensor/#findComment-439098 Share on other sites More sharing options...
IH Farms 2 Posted December 31, 2019 Author Share Posted December 31, 2019 17 hours ago, 41chevy said: You can use the gps or speedo phone app to set the dip switches on your new speedo. But I see with your set up all you need is an accurate mileage reference. Yep I just need to get the sender to produce a signal with the proper wires connected Quote Link to comment https://www.bigmacktrucks.com/topic/60331-mack-speed-sensor/#findComment-439126 Share on other sites More sharing options...
Rob Posted December 31, 2019 Share Posted December 31, 2019 Just now, IH Farms 2 said: Yep I just need to get the sender to produce a signal with the proper wires connected I got a generic one from "Summit Racing" for a participant here several years ago. You don't need to go extravagant in this application but do get an encapsulated type rather than open to preclude corrosion. Do solder and shrink tube your wiring connections for the same purpose. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/60331-mack-speed-sensor/#findComment-439127 Share on other sites More sharing options...
ivanuke Posted December 31, 2019 Share Posted December 31, 2019 On 12/29/2019 at 2:58 PM, IH Farms 2 said: Can anyone tell me how the 2 wire sensors should be wired? One is a signal wire I assume should the other one be grounded or powered? I had to change the trans in my superliner before Thanksgiving and the used trans i found has a speed sensor would like to get my speedometer working again. Have an autometer electronic guage installed already What year is your truck Quote Link to comment https://www.bigmacktrucks.com/topic/60331-mack-speed-sensor/#findComment-439130 Share on other sites More sharing options...
IH Farms 2 Posted December 31, 2019 Author Share Posted December 31, 2019 Just now, ivanuke said: What year is your truck 88 had a mechanical speedometer to being with I converted it to electronic 3 years ago. I do not know what year the trans came from other than newer Quote Link to comment https://www.bigmacktrucks.com/topic/60331-mack-speed-sensor/#findComment-439132 Share on other sites More sharing options...
ivanuke Posted December 31, 2019 Share Posted December 31, 2019 If its a 2 wire VRS sensor, polarity does not matter. It will generate an AC voltage and your autometer should be able to display the MPH. I would assume it would need to be calibrated some how, but i could be wrong i've never used aftermarket speedometer. Quote Link to comment https://www.bigmacktrucks.com/topic/60331-mack-speed-sensor/#findComment-439137 Share on other sites More sharing options...
IH Farms 2 Posted January 1, 2020 Author Share Posted January 1, 2020 4 hours ago, ivanuke said: If its a 2 wire VRS sensor, polarity does not matter. It will generate an AC voltage and your autometer should be able to display the MPH. I would assume it would need to be calibrated some how, but i could be wrong i've never used aftermarket speedometer. I'm gonna play with the wires tomorrow see what happens 1 Quote Link to comment https://www.bigmacktrucks.com/topic/60331-mack-speed-sensor/#findComment-439167 Share on other sites More sharing options...
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