DOME LIGHT PROBLEM
New User
Joined: Feb 2011
Posts: 6
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If you find out please let me know as well, my 1990 F150 has a similar issue that the dome doesnt work but the two spots on the sides of the center dome does. The bulb is good but door switches and the headlight switch have no control.
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
The map lights have their own switches in the dome light assembly. That is the ONLY control there is for them. If the dome light works, then the negative (ground) for the map lights is fine. the power feed for the map lights is the LT. GREEN/YELLOW wire from fuse #8 in the dashboard fuse block feeds the map lights. Fuse #8 feeds ALL of the interior lighting circuits so if you have dome lights then its NOT a blown fuse.
Posting Guru
Joined: Jan 2002
Posts: 1,346
Likes: 8
From: Baltimore
Here's the schematic for a 88 Bronco. Appears the wiring should be the same for a 90.
2nd diagram left side Figure 2 shows where a 3 wire Gray colored connector is.
You can test for 12 volts at that connector.
Black/Pink 12 volts for Dome and Cargo bulbs when headlight dome light switch
is turned on.
Light Green/Yellow 12 volts for the two map bulbs. Hot all the time.
Black/Light Blue 12 volts for Dome lamp when either LH, RH door is open.
The wires run along the driverside rocker panel then up the B pillar.
You might find a break in the Light Green/Yellow wire where it turns up at the B pillar.
2nd diagram left side Figure 2 shows where a 3 wire Gray colored connector is.
You can test for 12 volts at that connector.
Black/Pink 12 volts for Dome and Cargo bulbs when headlight dome light switch
is turned on.
Light Green/Yellow 12 volts for the two map bulbs. Hot all the time.
Black/Light Blue 12 volts for Dome lamp when either LH, RH door is open.
The wires run along the driverside rocker panel then up the B pillar.
You might find a break in the Light Green/Yellow wire where it turns up at the B pillar.
Lead Driver
Joined: May 2009
Posts: 6,804
Likes: 703
From: Tobyhanma, PA
Don't forget to check to make sure that A) there's a bulb in the socket, never know what the previous owner did. and B) that its a good bulb. That's where I'd start before checking wires and such.
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Sedric
1967 - 1972 F-100 & Larger F-Series Trucks
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Jan 5, 2003 11:06 PM
