I want to wire up Aux Back Up Lights

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1999Expy

Member - Posts: 3

Joined: May 22, 2003

Posted: May 22, 2003 at 2:27 PM / IP Logged

Hi folks I am new here. I am comfortable with wiring and have no trouble with connections but., I am a little fuzzy on the meaning of the numbers on relays (30,85,86,87a etc.) I have a 1999 Expedition and want to wire up auxiliary back up lights. I would like them to turn on when I put the vehicle in reverse. I understand that the reverse lights are the trigger for the relay. I have read the relay section/description. I am still confused. Could someone give me the knucklehead explanation as to what each number would actually be connected to? Thanks in adavance.

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1999Expy

Member - Posts: 3

Joined: May 22, 2003

Posted: May 22, 2003 at 2:48 PM / IP Logged

Would I be correct in saying that:

85: Revese light trigger

86: Ground

30: 12v+

87: Output+

87a: Output-

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hotrodelectric

Copper - Posts: 112

Joined: March 13, 2002

Location: United States

Posted: May 23, 2003 at 11:02 AM / IP Logged

You would be, except you hook nothing up to 87a, unless you want something on continuously until the relay is switched on. The ground for your lamps are just that- to ground. Don't ground them to the ground leads from the factory lamps- you run the risk of overload. You can ground 86 to the same point as your lamps- maybe at the bolt used to ground the factory lamps to the chassis, if you can find it. You are OK tapping the 85 to the factory lamps output- you are taking less than 1/2 amp to switch on the relay.

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I want to wire up Aux Back Up Lights

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