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Now its time
to find a place to mount your light. Do this before anything else,
because it sets your goal for the rest of the installation. On Jeep
TJs, in front of the driver-side body-mount closest to the front
fender, there is an existing hole located vertically and tucked
up very nicely away from the ground and other potential debris.
The hole faces inward so it is necessary to swivel the base of the
light 90-degree so that the lamp can point away from the vehicle.
When it came time to bolt the light into position, it was very difficult
to reach inside, but possible nonetheless! The mounting location
was further forward on the vehicle than I initially desired, but
was otherwise so perfect that I couldn't resist.
Next you need
a wiring plan! How are you going to do it? Where is your power source?
Where is your ground? Where is your fuse... your switch? All questions
you need to have answered before you begin running wires. In the
above illustration (not gonna give my scratch credit enough to call
it a diagram), you see what we COULD have done. Just an in-line
circuit from the battery, to the fuse, to the switch, and then to
the light... but no. This would be too simple! Besides, the switch
I decided to use is a special switch that isn't heavy-duty enough
to send that much electric through it to power the light. The switch
would have gotten hot and melted, or exploded.
2 - Continued...
went by the above illustration that uses a relay. Okay, how do I
describe a relay? A relay allows the light to get juice directly
from the battery. It doesn't have to go through a switch first that
might "bottleneck" the amount of power the light is getting.
Instead, your switch is turning the relay on and off instead of
the light itself. When the relay is on, the circuit between the
light and the power source is closed. This allows me to use the
fancy light-duty switch I chose to use without frying it, and allows
the light to shine as brightly as possible. Relays make the whole
deal alot more confusing than it has to be, but fortunately, the
terminals on all generic automotive relays seem to be numbered the
same way, so its not too difficult to figure out how the wires are
supposed to go. For your convenience, I've included the numbers
in the above illustration. If you plan on doing anymore lights on
your vehicle, hold on to that illustration!
We know how
we're going to wire it, so now dive right in. We will begin with
a ground wire. The base of the lamp on the rock-light is your ground,
but if you're installing it over paint, or if you're not bolting
it to your frame (and in this case we're not), you might just want
to take an extra five minutes and run a wire from the base of your
light, to a grounding point on your vehicle. On my TJ, I grounded
the light at the same spot the horns are grounded on the driver
side directly behind the headlight. Crimp loop-fasteners onto both
ends of the wire and attach one end to the ground, and the other
to the base of your rock-light.
Wire your hot
lead. Some folks have a special box under their hood that contains
a positive terminal specifically for wiring accessories like this.
I don't in my TJ, nor do I have plans for any other accessories
like this in the near future, so I chose to loop it to the stud
directly onto the positive terminal of my battery. I highly recommend
a special terminal for accessories, but if you don't have one...
then this will work. Nothing is worse than an underhood rat's nest!
Run a wire from
your light to the area in your engine compartment in which you are
going to mount your relay. You'll want to strip the tail on the
lead coming out of the tractor light, and crimp it to a longer wire.
Nothing to it!
5 - Continued...
Here's a diag...
er... I mean illustration of how the light is set up. The ground
you see in the illustration is the wire you ran to the grounding-location
next to your horns. The wire labelled "to relay switch"
is the one you just made longer and ran up into your engine compartment.
I also included a (30) to tell you that it goes to the terminal
labelled "30" on your relay. We'll worry about the relay
5 - Continued some more...
I included this
picture of the rock-light laying on the floor next to the Jeep just
to put things in perspective, and to further beat this "Step
5" to death. :) Consider this a "before" picture.
is all wired now, so go ahead and bolt it up to your predetermined
location. You can get that out of the way and not have to worry
about it again. Make sure its aiming the right way. Also make sure
your wires are tucked up above the light and not being pinched.
Tighten up the stud, difficultly in the case of my TJ, and you're
set! Consider this an "after" picture.
TO PAGE 3
Installing the in-line fuse...