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Negative Amps?


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txjeep 
Member - Posts: 18
Member spacespace
Joined: January 29, 2015
Location: Texas, United States
Posted: February 13, 2015 at 12:30 AM / IP Logged  
I am running a wire from an ACC hot wire, through a switch w/ and LED light, then to a relay. I put my clamp multimeter on the wire going into the switch, it shows 0.155A which make sense, since its powering the LED and the relay. I put my multimeter on the positive wire between the relay and the switch and it's showing a negative 0.050A.   How is it possible that my positive wire is showing a negative amp reading?
The LED switch is not fully illuminated, like the ground isn't the best. So even though that is a bit strange, how could you possibly get to a negative amp reading on a positive wire???
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: February 13, 2015 at 12:39 AM / IP Logged  
When you say "clamp" multimeter, do you mean your are using a current clamp?
If so, reverse the (DC) clamp direction, or realise that DC current clamps are not that accurate.
txjeep 
Member - Posts: 18
Member spacespace
Joined: January 29, 2015
Location: Texas, United States
Posted: February 13, 2015 at 1:04 AM / IP Logged  
Thanks oldspark. Amazing what happpens when you turn the clamp around. It magically shows a positive amp reading...

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