 1974 Headlight Switch pinout, 1974 Headlight Switch pinout |
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| mgarrison |
 Sep 16 2023, 12:16 PM
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#1
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Member  Group: Members Posts: 376 Joined: 14-February 20 From: Chandler, AZ Member No.: 23,922 Region Association: Southwest Region 
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Hello,
I was hoping to reuse the light switch that was in my 74, but I am really struggling with the "current flow diagram" vs a typical "wiring diagram". The wiring diagram for the 71 is much easier for my addled brain to follow. However, the 71 used a different light switch with fewer connections, so not much help! I no longer have popups, so I wont be using those connections, but hoping to use the connections for parking lights, headlights, and maybe the dimmer (knob twist) for the gauge lights. Here's what I THINK I have ferreted out from the 74 current flow diagram in the service manuals:  Here's the best pic I could get of my light switch that shows most of the connection numbers (11 total connections):  I hoping someone can maybe confirm what I have so far as accurate, or even better share where each connections goes/it's purpose (IMG:style_emoticons/default/pray.gif) |
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| 87m491 |
Sep 17 2023, 01:01 PM
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#2
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Member Group: Members Posts: 326 Joined: 29-July 12 From: Portland, the original! Member No.: 14,731 Region Association: North East States
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According to the current flow diagram,
30 is power to the headlight motors, K is power to instrument bulbs via the dimmer. QUOTE(mgarrison @ Sep 16 2023, 10:16 AM)  Hello, I was hoping to reuse the light switch that was in my 74, but I am really struggling with the "current flow diagram" vs a typical "wiring diagram". The wiring diagram for the 71 is much easier for my addled brain to follow. However, the 71 used a different light switch with fewer connections, so not much help! I no longer have popups, so I wont be using those connections, but hoping to use the connections for parking lights, headlights, and maybe the dimmer (knob twist) for the gauge lights. Here's what I THINK I have ferreted out from the 74 current flow diagram in the service manuals: Here's the best pic I could get of my light switch that shows most of the connection numbers (11 total connections): I hoping someone can maybe confirm what I have so far as accurate, or even better share where each connections goes/it's purpose (IMG:style_emoticons/default/pray.gif) |
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| JeffBowlsby |
Sep 17 2023, 03:14 PM
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#3
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914 Wiring Harnesses Group: Members Posts: 8,781 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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If it helps you here is a link to a Dash Switches circuit diagram on my harness website for the headlight switches. Various combinations of those connection tabs connect to different circuits dependent on what position the pull switch is in.
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| davep |
Sep 17 2023, 06:11 PM
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#4
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914 Historian Group: Benefactors Posts: 5,220 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada  |
K: illumination output for instruments. goes to fuse 7 input. often has a jumper for 58b but I replace with a wire from fuse 7 output so that the gauge lights are fused; several harnesses I have see had the jumper and other wires totally fried.
30: battery hot wire from fuse 10 input 30B: connected to 30 when switch is off, puts headlights in down position 58a: dimmer output for gauge illumination 58b: dimmer input; do yourself a favor and source from fuse 7 output |
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| mgarrison |
Sep 18 2023, 08:05 AM
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#5
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Member Group: Members Posts: 376 Joined: 14-February 20 From: Chandler, AZ Member No.: 23,922 Region Association: Southwest Region
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Thanks everyone - much appreciated! (IMG:style_emoticons/default/pray.gif)
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| mgarrison |
Sep 18 2023, 08:24 AM
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#6
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Member Group: Members Posts: 376 Joined: 14-February 20 From: Chandler, AZ Member No.: 23,922 Region Association: Southwest Region
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QUOTE(JeffBowlsby @ Sep 17 2023, 02:14 PM) If it helps you here is a link to a Dash Switches circuit diagram on my harness website for the headlight switches. Various combinations of those connection tabs connect to different circuits dependent on what position the pull switch is in. Your diagrams are a huge help! (IMG:style_emoticons/default/pray.gif) |
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