HOWTO: Side repeater

[Martin Gutkowski <webmaster@xxxx>]

When I was webmaster for the DeLorean Owners Club, this was on my tech 
page. As I am no longer, here it is for the benefit of DMCnews

Martin
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How to make the front marker lights double-up as side repeaters (indicators)

[Note: Parking lights are white and are called sidelights in the UK]

The result of this modification provides the following function:

1) With headlights/sidelights OFF, the side markers flash in time with 
the indicators

2) With the Headlights/sidelights ON, the marker lights light up as 
normal, but when indicating, the marker lights switch OFF in sequence 
with the indicators switching ON

THIS IS A VERY EASY MODIFICATION, though the job itself is much simpler 
with the front fascia removed, though it can be done where the wiring 
for the side markers joins the headlight loom behind the headlights

1: Take each side in turn. You should not need to remove the marker 
light covers. Locate the GROUND (Black) wire to the marker light and 
making sure you have a decent length of wire from the marker light, cut 
this wire. This removes the ground for the marker light

2: Of the three wires feeding the indicator bulb, locate the 
Green/Red wire.

3: Splice a wire from this lead and connect it to the ground wire 
feeding the side marker.

4: Repeat for the opposite side and that's it!

WHY IT WORKS (the bit you can ignore if you wish). A bulb is a resistive 
device and as such will work plugged in either way around.

1: When the indicator is OFF, the Positive feed to the indicator bulb 
is grounded.

2: When the side marker light is OFF, the Positive feed to the marker 
bulb is grounded.

3: When the side marker is OFF, and the Indicator is ON, the maker 
will light up because its ground wire gets pulled to 12v through the 
indicator, and its Positive feed is grounded (see 2)

4: When the side marker is ON, its ground wire is grounded through 
the positive feed to the indicator (see 1).

5: When the side marker is ON, and the indicator is ON, both the 
supply side and the ground side of the marker light's bulb is 12v, so it 
turns off.