hooking up relay?

Home / the12volt's Install Bay / Relays / hooking up relay? (

Topic Closed)

Welcome Guest :)

Members

Next Page > < Prev Topic Next Topic >

oxygen65

Silver - Posts: 252

Joined: August 19, 2005

Location: United States

Posted: August 30, 2006 at 10:23 PM / IP Logged

i read the section about relays on the 12 volt and i dont understand it really so i was wondering if somone could explain it to me a little better or draw me some kind of diagram.

im trying to hook up video monitors in my car and i want to do 6 or 7 of them and everyone is telling me that i can not just run all of them off of the acc wire, and that i need to add a relay. well i dont understand how to hook it up. i think what eveeyone means by using the relay is that the acc wire is hooked up to one side of the relay and then a constant 12 volt is hooked up on the other side and when the acc wire gets power it lets the constant 12 volt wire go threw. i think that might be it but im not sure, anyways if someone could draw me a pic of how im suposed to do that i would really appriciate it. thanx

swamprat323

Gold - Posts: 1,335

Joined: September 22, 2002

Location: Florida, United States

Posted: August 31, 2006 at 12:57 AM / IP Logged

im not sure how much power the moniters draws, may need 2 relays or a bigger relay. soem one here shold coem along and give soem info onhow much they draw.

but lets say 1 SPDT 30 amp realy can handel the job.

85 ground

86 form ACC

87 12 volt

30 to power the moniters

mrjc480

Member - Posts: 44

Joined: December 16, 2004

Location: United States

Posted: August 31, 2006 at 3:07 AM / IP Logged

A common relay has (5) post. 87a is connected to 30 normally. When 85 and 86 receive 12+ and 12-, the pin pivots from 87a to 87 thus breaking the 87a/30 circuit and connecting 87/30. Connect 85 to gnd, 30 to your monitors, 87 to a fused wire directly to your battery, and 86 to your accessory wire. Be sure to cap off 87A cuz it will show 12+. When the key is turned to activate the accy wire, it will energize the relay, thus passing current from the battery to the monitors.

Im moving to MEXICO and Im not speaking spanish!

oxygen65

Silver - Posts: 252

Joined: August 19, 2005

Location: United States

Posted: August 31, 2006 at 1:33 PM / IP Logged

when you say to make sure i cap off 87a becuse it will show 12+ what do you mean by that? do you mean just hook up a conecter onto it that has no wire?

oxygen65

Silver - Posts: 252

Joined: August 19, 2005

Location: United States

Posted: August 31, 2006 at 1:42 PM / IP Logged

another question i have is what size wire can a use to hook up 87? if i used something like a 10 or 8 ga wire will i blow the relay? becuse im tring to run 6 to 7 monitors off of that one relay. somone mentioned how much they draw. the only info i can come up with on that is they draw like 7 watts so i dont know how you can figure if a 30 amp relay is can handle all that, but i did find a 13 inch flip down tv and it said that power draw was like 3 amps. but anyways im just wondering what size wire i can run from my battery to 87 on the relay.

oxygen65

Silver - Posts: 252

Joined: August 19, 2005

Location: United States

Posted: August 31, 2006 at 1:47 PM / IP Logged

or would just buying relays with the relay sockets work best and do the same thing?

bsd1

Copper - Posts: 62

Joined: August 01, 2006

Location: California, United States

Posted: August 31, 2006 at 4:04 PM / IP Logged

oxygen65 wrote:

<FONT color=#0000cc size=2>when you say to make sure i cap off 87a becuse it will show 12+ what do you mean by that? do you mean just hook up a conecter onto it that has no wire?

pin87a connects to pin30 when your relay is idling. When it's idling, pin30 gets no 12V+, therefore, pin87a does not need to be cap off. Leave the 5 pin relay as is is fine.

For caution, yes, you can plug a connector and cover up pin87a since it's not in use. And you don't want pin87a to touch any metal in your car while the relay is energizing to cause a short.

oxygen65

Silver - Posts: 252

Joined: August 19, 2005

Location: United States

Posted: September 01, 2006 at 12:38 AM / IP Logged

what about the size of the wire i use to run 87 from my battery? what size should that be? or does it not really matter? becuse im using it to run 6 or 7 monitors.

mrjc480

Member - Posts: 44

Joined: December 16, 2004

Location: United States

Posted: September 01, 2006 at 4:10 AM / IP Logged

Add up the amp draw of ALL monitors. If the total is less than 30 amps, then you can use one relay with a 30 amp fuse on a 16 ga or bigger wire. The easiest thing to do is to buy a video amplifier with built in power leads and relays.

Im moving to MEXICO and Im not speaking spanish!

oxygen65

Silver - Posts: 252

Joined: August 19, 2005

Location: United States

Posted: September 01, 2006 at 2:03 PM / IP Logged

and were can i find a video amplifer like that becuse i have never seen one?

Next Page >

Printable version

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Search the12volt.com

Follow the12volt.com

Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.