Headlight Switch
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Mountain Pass
Joined: Sep 2004
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From: Gurnee, IL
Headlight Switch
I have a 1977 F250 that I am installing a Painless Performance wiring harness in and am have some trouble identifying where to hook up the new wires to. I have no origianal wiring in the truck. I have a headlight switch out of a 79 Bronco and it has 8 prongs on it. They are: A, B, P, D1, D2, I, R and H. Can anyone tell me what each of these prongs would be for? Any help is greatly appreciated.
Bill
Bill
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btacarlton, head light switch terminology
A - red wire - positive power from fuse fuse block
-
D1 - yellow wire - dome light > positive power in from fuse block
D2 - white wire - to dome light > positive power out to dome light
H - light blue wire - to dimmer switch > from head light switch to top prong on dimmer switch
R - brown wire (parking lights and side lights)
----------------------Buck--------------------
A - red wire - positive power from fuse fuse block
-
D1 - yellow wire - dome light > positive power in from fuse block
D2 - white wire - to dome light > positive power out to dome light
H - light blue wire - to dimmer switch > from head light switch to top prong on dimmer switch
R - brown wire (parking lights and side lights)
----------------------Buck--------------------
Last edited by 1975Ford; Mar 21, 2006 at 01:07 PM.
Thread Starter
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Mountain Pass
Joined: Sep 2004
Posts: 240
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From: Gurnee, IL
I do have wiring diagrams but in the original harness, power for certain circuits are routed through other circuits. And of course the diagrams do not show the letters that are on the switch. I tried to check resistance across the different prongs on the switch, but I believe that each light off the switch gets it's ground somewhere other than the switch. Needless to say, this is the first wiring project that I have undertaken and am learning as I go. Again, any help is appreciated. Thanks.
Bill
Bill
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Mountain Pass
Joined: Sep 2004
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From: Gurnee, IL
Sorry, when I looked at your post the first time there was no wire designations. Probably a computer error on the page or something. Thanks for the help.
Bill
Bill
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Mountain Pass
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From: Gurnee, IL
OK, I have now talked to two different techs at Painless Performance this is what they tell me:
A - Not used
B - Power
P - Park Lights
I - Instrument/Dash Lights
R - Tail lights
H - Dimmer
D1, D2 - Dome?
One tech says the ground from the dome light goes to D1 and the other tech say it depends on the type of switch, because some switch ground and others switch power.
This Painless kit is getting more PAINFUL by the minute.
A - Not used
B - Power
P - Park Lights
I - Instrument/Dash Lights
R - Tail lights
H - Dimmer
D1, D2 - Dome?
One tech says the ground from the dome light goes to D1 and the other tech say it depends on the type of switch, because some switch ground and others switch power.
This Painless kit is getting more PAINFUL by the minute.
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Ok, painless wiring can be confusing, like to add,
B - battery power from fuse box for headlight switch.
D1 - dome light > positive power in from fuse block
D2 - to dome light > positive power out to dome light
disregard colors of wire mentioned above.
What wiring kit are you using?
B - battery power from fuse box for headlight switch.
D1 - dome light > positive power in from fuse block
D2 - to dome light > positive power out to dome light
disregard colors of wire mentioned above.
What wiring kit are you using?
Thread Starter
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Mountain Pass
Joined: Sep 2004
Posts: 240
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From: Gurnee, IL
I am using an 18 circuit universal truck harness. So is A the power or is B the power? Or am I just not understanding?! All these colors and wire numbers from painless are starting to twist my brain!
Thread Starter
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Mountain Pass
Joined: Sep 2004
Posts: 240
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From: Gurnee, IL
Yes, I didn't do enough research before I bought this kit. Well I have a few different ways to try hooking the dome light up. According to the Painless manual, power from the fuse box goes directly to the dome light and the ground is not very clearly described. How do I incorporate the door jamb switches into the mix?
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Part number 10204,
A - Not used
B - Positive "+" Power from fuse panel to the head light switch- 928 - red/black 12 guage wire
P - Park Lights and side lights section- 927 (18 guage park lights front) brown wire
I - Goes from headlight swithc to Instrument panel /Dash Lights - 930 - brown 18 guage wire
R - Tail lights - 929 (14 guage tail lights)- brown wire
H - to dimmer switch - 907 - from head light switch to top prong on dimmer switch (metal prong top / nearest push button on dimmer switch) - blue / white 14 guage wire
D1 and D2 terminals on Head light switch, refer to post title Dome light.
A - Not used
B - Positive "+" Power from fuse panel to the head light switch- 928 - red/black 12 guage wire
P - Park Lights and side lights section- 927 (18 guage park lights front) brown wire
I - Goes from headlight swithc to Instrument panel /Dash Lights - 930 - brown 18 guage wire
R - Tail lights - 929 (14 guage tail lights)- brown wire
H - to dimmer switch - 907 - from head light switch to top prong on dimmer switch (metal prong top / nearest push button on dimmer switch) - blue / white 14 guage wire
D1 and D2 terminals on Head light switch, refer to post title Dome light.
Last edited by 1975Ford; Mar 21, 2006 at 03:35 PM.