Vis Motor Tester?

Simon.h · 19th June 2014, 21:16

Hi all,
Why does all the vis testers use a 9v battery?
Why can't the tester run off the car's battery?

Phil-T4 · 19th June 2014, 21:35

Even with a knackered vis motor the car battery can still spin it, i have seen some draw up to 7 amps on my power supply.
The correct current draw is around 60mA (?) which a 9v battery can supply easily, so if it works with a 9V battery its fine

Simon.h · 19th June 2014, 21:52

Quote:

Originally Posted by Phil-T4

Even with a knackered vis motor the car battery can still spin it, i have seen some draw up to 7 amps on my power supply.
The correct current draw is around 60mA (?) which a 9v battery can supply easily, so if it works with a 9V battery its fine

Cheers but can I use a tester being powered from the cars battery with out damaging the tester or vis motor?

Phil-T4 · 19th June 2014, 21:56

You could yes, if the motor is already knackered the chances are the track on the pcb has already burnt out so no further damage would take place.

19th June 2014, 21:16	#1
Simon.h This is my second home Previously owned- MG ZT V6 160 Y plate Lpg, MG ZT 190 2003 In Rare Celestial Factory Ordered Lpg MG Join Date: Mar 2010 Location: Calne Posts: 4,531 Thanks: 8 Thanked 116 Times in 108 Posts	Vis Motor Tester? Hi all, Why does all the vis testers use a 9v battery? Why can't the tester run off the car's battery? __________________ Previously owned- MG ZT V6 160 Y plate Lpg, MG ZT 190 2003 In Rare Celestial Factory Ordered Lpg MG ZT 190 2004 lpg

19th June 2014, 21:35	#2
Phil-T4 I really should get out more....... MG ZT-T, Rover 75 Tourer Join Date: Mar 2011 Location: Olney Posts: 2,969 Thanks: 245 Thanked 1,088 Times in 657 Posts	Even with a knackered vis motor the car battery can still spin it, i have seen some draw up to 7 amps on my power supply. The correct current draw is around 60mA (?) which a 9v battery can supply easily, so if it works with a 9V battery its fine

19th June 2014, 21:56	#4
Phil-T4 I really should get out more....... MG ZT-T, Rover 75 Tourer Join Date: Mar 2011 Location: Olney Posts: 2,969 Thanks: 245 Thanked 1,088 Times in 657 Posts	You could yes, if the motor is already knackered the chances are the track on the pcb has already burnt out so no further damage would take place.