Relay for Tow Charge Indicator

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eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: December 06, 2019 at 5:16 PM / IP Logged

jrschatz wrote:

Thanks for your help. And for the sake of learning — is the reason my relay would not work because I was trying to run it in series with the 12v line?

Correct, the relay coil cannot be in series with a low resistance (high current) load.

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i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: December 07, 2019 at 4:17 AM / IP Logged

Have you thought about an amp meter installed in the truck? 15 bucks on amazon, you will have to put the shunt in series with the wire going to trailer. It will give you voltage and current real time.

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eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: December 08, 2019 at 10:12 AM / IP Logged

i am an idiot wrote:

Have you thought about an amp meter installed in the truck? 15 bucks on amazon, you will have to put the shunt in series with the wire going to trailer. It will give you voltage and current real time.

Do you have a link?

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i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: December 08, 2019 at 12:49 PM / IP Logged

https://www.amazon.com/s?k=12+v+dc+ammeter&ref=nb_sb_noss_2

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eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: December 08, 2019 at 7:18 PM / IP Logged

i am an idiot wrote:

https://www.amazon.com/s?k=12+v+dc+ammeter&ref=nb_sb_noss_2

At the $15 price point you quoted in your post, I don't see any products where the shunt is installed in the +12V feed - all are installed on the ground side. As I explained in my earlier post, monitoring the ground side for a trailer application is not feasible.

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