ELECTRICAL HOW TO'S
DOME LIGHT CONVERSION TO OPERATE
WITH DOOR JAM SWITCHES
Their is a difference in wiring the relay depending on
the switch being used so I'm including both schematic depending on the
headlight switch being installed.
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STOCK HEADLIGHT SWITCH
The original dome light circuit operates in the following
manner:
-
Full Time B+ current is sent to the dome light switch
-
Ground is completed through the dome light housing to the
cab
-
When the switch is moved to the on position the light illuminates
Wishing to have the dome light illuminate when the door is
opened I came up with the following conversion shown below. Basically
all I did was wire in a relay that is triggered by the grounding of the
door jam switch to send current up to the dome light.
The conversion requires the following materials:
-
(1) Bosch relay
-
(2) door jamb switches
-
(1) roll of 16 ga. black wire
-
(1) roll of 12 ga. red wire
-
(1) fuse holder and a 5 amp fuse
-
(1) package of solder less terminals
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NEWER STYLE HEADLIGHT SWITCH CONVERSION:
The newer style of Headlight switch operates by sending a
negative signal from the switch up to the dome. This style of operation
will not work with a stock dome light which using only a positive B+ signal
to illuminate the original dome light. The solution to this problem
was to wire in a relay that would send the correct current up to the stock
dome light.
The Dome light will now illuminate when the:
-
Headlight switch is rotated fully counter clockwise dome
light switch
-
Door is opened
-
When the dome light switch is moved to the on position
The conversion requires the following materials:
-
(1) Bosch relay
-
(1) New Style Headlight Switch
-
(2) door jamb switches
-
(1) roll of 16 ga. black wire
-
(1) roll of 12 ga. red wire
-
(1) fuse holder and a 5 amp fuse
(1) package of solder less terminals
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