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Wiring for auxiliary rear lights

Discussion in 'Commercial Snow Removal' started by Alan, Sep 29, 2002.

  1. Alan

    Alan PlowSite.com Addict
    Messages: 1,393

    This is the setup I run for powering my auxiliary reverse lights. If you choose to run them off your existing backup light line but don't always want them to come on when you hit reverse or if you want to be able to have them on full time the diagram on the left is the one you want.

    If you want to use a relay to switch the heavy current for the lights use the diagram on the right.

    Either way you need a single pole, double throw (SPDT) switch with center off. That gives you three options, constantly on, never on, or on with your factory lights.

    The relay diagram is how I do it. That way the reverse light switch is never carrying the heavy load of the extra lights. I found out the hard way that the stock switch may do fine with only two 1156 bulbs but adding 70 watts of load shortens the life of it a lot.

    Be sure to fuse the power lead. The "tractor" lights are 35 watt, two of them will need a 10 amp fuse. 50 watt halogens will need 15 amps and 100 watt halogens will have to have a 20 amp fuse in the line.

    My thanks to Chuck Smith for doing the diagram up in a format that I could post here. My original file was too big.

  2. Chuck Smith

    Chuck Smith 2000 Club Member
    from NJ
    Messages: 2,317

    Bumping this back up to the top.

  3. Pelican

    Pelican 2000 Club Member
    Messages: 2,075

    I'm trying to figure out how to do this yet isolate my back-up alarm when I've got the lights turned on. I'm thinking a relay to cut out the backup alarm when the switch is thrown, I guess I could use the same exciter wire as to the flood relay. Are there relays that open circuits when activated?
  4. wxmn6

    wxmn6 PlowSite.com Addict
    Messages: 1,037

    Yes, most 30A-40A-50A relays (especially Bosch) have both NC and NO contacts. It should have 5 terminals.
  5. wyldman

    wyldman Member
    Messages: 3,265

    If you wire your backup alarm off the truck reverse lights,and use a setup like Alan's above,then the alarm is isolated when you throw the switch for the backup lights.It only comes on when the truck is in reverse.
  6. Pelican

    Pelican 2000 Club Member
    Messages: 2,075

    In my case I've replaced the back up lights with 4" flood lights on my cab & chassis. I'm going to set them up so they can be switched on in addition to the reverse switch. If I put a relay on the alarm that opens when excited, this should work.
  7. SnowGodFather

    SnowGodFather Member
    Messages: 330

    Yet another great post from Alan, (enter brown-nosing comments here).

    Thanks. I have been trying to figure a way to hook them up off the batt and not the back up light circuit, you cave me a great idea.

    Use the back-up light circuit to trigger the relay to turn them on.