Issue with 25V voltage sensors

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hi all,

forgive newbie question having problem.  want measure voltage on scalextric track (slot racing).  maximum voltage 19v. 

i have spliced controller handset lead have 2 additional leads coming off feed sensor such in attached diagram (red vcc, green gnd).  arduino connections a1 (analog input 1) , gnd.  works fine, though readings gathered noisy.


of course there 2 tracks (cars) on scalextric set!  however, when connect second controller second voltage sensor (same schematic, analog input 2 , other gnd on arduino) car in first track takes off without pressure on controller.  there short in circuit, there path created return current first car, continuity test shows no obvious issue.  have idea should start looking issue?

many thanks,

stephen

i'd love help, need few things first:

1. post code in </> tags (read "how use forum" post)!!!!!!
2. 25v sensor?
3. m device in picture provided?
4. what purpose of arduino?
5. can provide pics on splicing did on hand controllers?
6. track voltage represent?



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