Auto Repair & Mechanics : How to Wire a Relay

In order to wire a car relay, an individual can usually follow the wiring schematic that is molded into the side. Find out how to get power to flow from pin 30 to pin 87 with help from an auto mechanic in this free video on car repairs and mechanics.

Expert: J.B. Hebert
Contact: www.wrxtra.com
Bio: J.B. Hebert is a machinist, metal fabricator, and auto mechanic who has been fixing and modifying all things mechanical for over 20 years.
Filmmaker: David Pakman

Category:

Autos & Vehicles

Tags:

• auto
• repair
• car
• maintenance
• troubleshooting
• problems
• automotive
• repairs
• vehicles
• brakes
• fuel
• pumps
• motors
• wiring

[billmalta1]

Fantastic video!!!

Kept simple and clear!

I was connecting the charge controler of my wind turbine and could nt figure out where the dump load wire was :o) Thx a million!

[abejimeneza67c10]

Thank super easy. Lol

[mrpr1ngles]

do you need a fuse holder when you have a relay?

[davidelias13]

Helpful, simple and clear explanation. It was helpful to me, thanks.

[joshdachump]

@Danboy5050 because when you turn the car off you will flatten the battery

[strutter169]

this isnt real descriptive,&3real,u need 2wire a relay cause if you just jump 2 acc 1st is your overloading the existing relay from the unit(relays are30/40 amps usually)&2 the factory has those 2 wires independent for a reason, youneed 2duplicate whatthe factory does for safety,use ground when running output from remote start (if not used for a securitybypass) to pin 85, pin 86 to your 1st accessory out from remote start, pin30 to 12vconstant(thru a fuse)&pin 87 to your 2nd acc wire in the car

[th3realjonv]

I'm about to install a remote car starter; but the car has 2 accessory wires and only 1 of the unit's 14 connections is for accessory. Can I just split the wire and fuse to each accessory, or do I need to install a relay? If so, why? Thank you

[th3realjonv]

I'm about to install a remote car starter; but the car has 2 accessory wires and only 1 of the unit's 14 connections is for accessory. Can I just split the wire and fuse to each accessory, or do I need to install a relay? If so, why? Thank you!

[deef3]

That helped a lot.  Thank you!

[noahjm10]

86 should be the trigger (source) & 85 ground. But it will work in reverse as long as the relay body is not the older steel grounded ones.