how do i check for a relay draw?

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rye2

Copper - Posts: 46

Joined: August 09, 2002

Location: Canada

Posted: November 08, 2003 at 10:15 AM / IP Logged

hi,

I'm interested to know how would I check to see if a SPST automotive relay is drawing current when the car is off? I have alwasys had trouble in this area.

I need some help, how do you measure it usinc a DMM and if someone could explain where the leads go and on what pins etc.....

I don't want to end up having a circuit that will have a draw that will eventually kill my battery...

Thanks.....

i'll be using a 5 pin relay, pins 85, 86, 87, 87a, 30.

auex

Platinum - Posts: 5,041

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Joined: December 23, 2002

Location: Arizona, United States

Posted: November 08, 2003 at 10:32 AM / IP Logged

As long as the relay isn't energized at all times then there shouldn't be any draw. This means that if you are worried about it causing a draw hook up the relay to turn off with either an ignition or accessory wire.

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rye2

Copper - Posts: 46

Joined: August 09, 2002

Location: Canada

Posted: November 08, 2003 at 10:42 AM / IP Logged

Oh, ok i'll keep that in mind....Thanks

jrinbc

Member - Posts: 14

Joined: October 27, 2003

Location: Canada

Posted: November 08, 2003 at 1:06 PM / IP Logged

I assume you are interested in knowing if it is drawing across the coil (pins 85,86). If so, set your dmm for dc current. A coil normally draws less than 200mA so set your DMM accordingly. Current is measured in series so disconnect one of the coil pins (I use 85) connect the neg probe of your DMM to the wire you just disconnected. The pos probe goes to the pin on the relay. That's it.

Good luck.

rye2

Copper - Posts: 46

Joined: August 09, 2002

Location: Canada

Posted: November 08, 2003 at 2:56 PM / IP Logged

thanks, this is great information

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how do i check for a relay draw?

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