With the wiring installation winding
down on our 1969 beetle, we'll next move to the dome light harness.
Start inside the car, then pry or
pop out the dome light lens by prying up on the edge and then disconnect the
wires from the light. Securely tape the old harness to a six to eight foot piece length
of wire. Then inside the trunk, pull the harness down the A pillar from the
driver's side of the trunk near the hood hinge. An assistant can be handy to
hold the drag line at the dome light to make sure it doesn't get pulled too
far, or as you can in our case, tie it to an old headliner bow.
Once the harness is pulled down,
unwrap the old harness from the drag line then securely tape the new harness to
the drag line. Have your assistant pull the drag line from the dome light
opening, while you guide the harness in from the trunk. With the wires pulled
up to the dome light opening, un-wrap the harness and the drag line and connect
the new harness to the dome light lens.
The red wire attaches to the
terminal opposite of the switch.
The brown and white wire would
attach to the other terminal.
In our case our dome light only has
one terminal at the switch side as it is self-grounding. So we'll make certain
that it has a clean, bare metal surface to ground out against the body when
installed. If you don't have a third
terminal, make sure to tuck the brown wire back or tape off the terminal, so it
does not ground out to the red wire by mistake.
In the trunk, plug the first
connection of the brown and white wire to the driver's side door jamb switch. Route
the remainder of the harness along the back of the dash, underneath the
speedometer. Plug the brown wire into the ground tab on the upright brace
behind the fuse box. Plug the red wire
into the back terminal on the front side of the fuse box, at the second fuse
terminal from the cars right side. Lastly route the long portion of the brown
and white wire along the back of the dash, underneath the glove box opening,
and plug it into the passenger side door jamb switch.
Next, were going to hook up the
various wires coming out of the ignition switch turn signal switch and the horn
wire from the steering column bearing. These wires enter the trunk from the
bottom side of the dash, on the cars left side near the spectrometer.
SIDE NOTE: There are three wires
from the steering column harness that should already be hooked up, as we
installed them in part three of our video series.
The thicker of the two brown wires
coming from the harness, which hooked up from the headlight harness and the
black and white and black and green wires from the harness are hooked up to
their quad connectors.
The ignition switch has three wires,
one a long red thick wire another thick black and red wire and a black wire.
The long red wire plugs into one of
the 30 terminals on the headlight switch.
The black and red wire plugs into
the thick red starter wire from the main harness, with a shrouded connector.
The black wire plugs into the back
terminal on the first fuse terminal from the cars left side.
The pigtail from the black wire
plugs into the bottom tab on the speedometer below the indicator bulbs.
The thinner brown wire from the turn
signal switch plugs into the ground terminal, on the left speedometer mounting
The brown and white wire from the
turn signal switch connects to the F terminal on the headlight relay.
The black, white, and green wire
plugs into a shrouded connector and will connect to the flasher wiring later.
There are six loose wires for the
emergency flasher switch, all roughly 15 to 20 inches long. It is easiest to
attach them to the flasher switch first then run them to their designated
The white wire plugs into the
positive or plus terminal on the switch then connects to the 49 terminal on the
The black wire plugs into the 15
terminal on the switch then connects to the back terminal on the front side of
the fuse box, at the first terminal from the cars left side.
The 19 inch red wire connects to a
30 terminal on the switch with the plastic shrouded connector at the switch and
then into the front terminal on the front side of the fuse box at the second
fuse terminal from the cars right side.
The black, white wire connects to
the L terminal on the switch then connects to the H connector with the other black
and white wire.
The black and green wire connects to
the R terminal on the switch then connects to the H connector with the other
black and green wires.
The blue wire with the small white
black green pigtail, attaches to the 49A terminal on the switch then connects
to the 49A terminal on the flasher relay.
The side with the black white green pigtail
is the side that attaches to the relay.
That pigtail then attaches to the
shrouded connector we installed earlier on the black white green wire from the
turn signal switch.
One more loose wire is needed to
hook up the flasher relay to the indicator bulb on the speedometer.
It's a short blue and green wire that
attaches to the lower center bulb on the speedometer and to the relays KBL
terminal if you have a four prong relay or the 49A terminal if you have a three
There are six loose wires that will
hook up the headlight switch, headlight relay and fuse box. The black and white
wire attaches to the 56 terminal on the headlight switch, and the headlight
SIDE NOTE: If you have a five prong
headlight relay, you will need to run a jumper wire from the 56 terminal to the
30 terminal for the five prong relay to operate.
The white wire attaches to the third
and fourth fuses at the third terminal from the cars left side on the fuse box and
connects to the 56A terminal on the relay.
The yellow wire attaches to the fifth
and sixth fuses at the fourth terminal from the cars left side and connects to
the 56B terminal on the relay.
The gray wire attaches to the third
and fourth fuses at the third terminal from the cars right side of the fuse box
and connects to the 58 terminal on the headlight switch.
The red and white double wire
connects to the 58B terminal then to the right and left speedometer illumination
The thick 15 inch long red wire
connects to the 30 terminal on the switch, and connects to the fuse box at the
second fuse from the cars right at the rear terminal.
Connect the four loose wires from
the windshield wiper motor to wiper switch.
The brown wire attaches to both the
31B terminals, one on the motor one on the switch.
The black wire attaches to the 53
terminal on the motor, and again on the switch.
The black and red wire attaches to
the 53A terminals.
The black and yellow wire attaches
to the 53B terminals, again one on the motor one on the switch.
Two more loose wires are needed for
the wiper motor and brake light warning switch. Connect the green wire with the
black 1/10 connector at one end to the back terminal at the front of the fuse
box on the second fuse from the cars left. The opposite end of the green wire
plugs into the 30 terminal on the wiper switch. From there, the black wire with
the 1/10 connector attaches to the 15 terminal on the brake light switch. Connect
the 18 inch long red wire with the 1/10 connector on it to the K terminal on
the switch, and then to the red wire from the front break harness, with a
Now run the ground harness which has seven terminals on a "daisy chain" six of the terminals have 1/4 inch
connectors, and one of the terminals is a 1/10 connector. It's easiest to start
with the 1/10 connector to orient the harness and run it from there.
The 1/10 connector plugs into the 31
terminal on the brake warning light.
The next connector plugs into the 31
ground tab on the side of the emergency flasher switch.
The next connector plugs into the 31
ground tab on the side of the windshield wiper switch.
The next connector plugs into the
ground tab on the upright brace behind the fuse box.
The next plugs into the ground tab
on the right side of the speedometer.
The second to last connector plugs
into the 31 terminal on the flasher relay.
The last connector plugs into the
[number] three terminal on the wiper motor.
The only wire left at this point,
should be a brown wire in a black sheath. It connects to the sending unit on
the fuel tank, to the back of the fuel gauge which is attached to the
With that, all the wiring should now
be installed. Double check all the connections for any loose or unconnected
wires. Note that we haven't installed the switches to the dash so we can test
them once the battery is connected. Make sure that the switches won't contact
any grounds or other wires where they can possibly short out. Make sure all the
switches are in the off position before hooking up the battery. Carefully
connect the battery cable with the positive cable first then the ground cable. If
you can hear any sparks or smell or see smoke, immediately pull off the
negative cable and correct the issue. If everything is installed correctly,
which it should be, then now is the time to test, and troubleshoot which we
will cover in our next video.