 How your Headlight Motors Work., A description with pictures. |
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| ClayPerrine |
 Nov 18 2004, 09:02 AM
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Life's been good to me so far.....  Group: Admin Posts: 16,292 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille 
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NOTE: DUE TO MY NOT LOOKING AT THE WIRING DIAGRAM BEFORE POSTING THIS, I HAVE EDITED IT TO REFLECT REALITY!! (IMG:style_emoticons/default/headbang.gif)
I noticed that there is a lot of questions out there relating to how the headlight motors work. So I put this together to see if I can clear it up. The headlight motor circuit functions like a 3 way light switch in your house. You all have seen them. The one you can turn on at the bottom of the stairs and turn off at the top. Well, when you turn on the headlights in a 914, you turn on the headlight motor. It's rotation turns off the headlight motor when the lights are up, using a set of wiper contacts in the motor. In the first diagram below, I outline the headlight circuit with the lights in the down position. Attached thumbnail(s) 
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| 1973TwoLiter914 |
Apr 29 2020, 02:08 PM
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#2
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Newbie Group: Members Posts: 2 Joined: 26-September 17 From: Cincinnati Member No.: 21,463 Region Association: Upper MidWest |
Clay - great visual ! I'm having issue with headlight synchronization and hoping your diagram and perhaps a reply could help me sort out the details...
- Both headlights Hi/Lo work, however it's a 1 Up and 1 Down situation - Left headlight operates perfectly in relation to the switch.....when switch is pulled out the headlight turns on and flips UP just fine. - Right headlight operates in the 'opposite' manner - meaning it is UP with the switch OFF and turns on and flips DOWN when the switch is pulled.......leading to a head scratcher. I've pulled the relay on the RIGHT light and tried to cycle thru with no result......wondering if the wires to the RT motor are somehow not lining up with the proper pins ??? Any help would be great ! |
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| ClayPerrine |
Apr 30 2020, 12:15 AM
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#3
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Life's been good to me so far..... Group: Admin Posts: 16,292 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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QUOTE(1973TwoLiter914 @ Apr 29 2020, 03:08 PM)  Clay - great visual ! I'm having issue with headlight synchronization and hoping your diagram and perhaps a reply could help me sort out the details... - Both headlights Hi/Lo work, however it's a 1 Up and 1 Down situation - Left headlight operates perfectly in relation to the switch.....when switch is pulled out the headlight turns on and flips UP just fine. - Right headlight operates in the 'opposite' manner - meaning it is UP with the switch OFF and turns on and flips DOWN when the switch is pulled.......leading to a head scratcher. I've pulled the relay on the RIGHT light and tried to cycle thru with no result......wondering if the wires to the RT motor are somehow not lining up with the proper pins ??? Any help would be great ! There is a connector near the headlight motor with 3 wires in it that hooks the motor to the wire harness. Check it on the side that is working backwards, and verify the wire colors match from one side of the connector to the other. Clay |
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| partwerks |
Sep 30 2021, 06:46 PM
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#4
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Senior Member Group: Members Posts: 1,611 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
QUOTE(ClayPerrine @ Apr 29 2020, 10:15 PM) QUOTE(1973TwoLiter914 @ Apr 29 2020, 03:08 PM) Clay - great visual ! I'm having issue with headlight synchronization and hoping your diagram and perhaps a reply could help me sort out the details... - Both headlights Hi/Lo work, however it's a 1 Up and 1 Down situation - Left headlight operates perfectly in relation to the switch.....when switch is pulled out the headlight turns on and flips UP just fine. - Right headlight operates in the 'opposite' manner - meaning it is UP with the switch OFF and turns on and flips DOWN when the switch is pulled.......leading to a head scratcher. I've pulled the relay on the RIGHT light and tried to cycle thru with no result......wondering if the wires to the RT motor are somehow not lining up with the proper pins ??? Any help would be great ! There is a connector near the headlight motor with 3 wires in it that hooks the motor to the wire harness. Check it on the side that is working backwards, and verify the wire colors match from one side of the connector to the other. Clay In the last paragraph. Is that something that could have accidentally been changed on both sides, that would make my lights go down when the switch is pulled out? Picture of it would be nice. Also, is there a diagram of the wires that go to the headlight switch, and colors. It's on a 1975. |
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| ClayPerrine |
Oct 2 2021, 11:02 AM
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#5
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Life's been good to me so far..... Group: Admin Posts: 16,292 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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In the last paragraph. Is that something that could have accidentally been changed on both sides, that would make my lights go down when the switch is pulled out? Picture of it would be nice. Also, is there a diagram of the wires that go to the headlight switch, and colors. It's on a 1975. [/quote] If the wires on the plugs between the headlight motors and the harness is hooked up wrong, the light will go down when the switch is turned on. I don't have a 75 wiring diagram. The bird board used to have them up on it, but Porsche got pissy and made them take it down. You can go to the wayback machine and find them there. Clay |
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| partwerks |
Oct 2 2021, 04:03 PM
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#6
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Senior Member Group: Members Posts: 1,611 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
[quote name='ClayPerrine' date='Oct 2 2021, 09:02 AM' post='2949812']
In the last paragraph. Is that something that could have accidentally been changed on both sides, that would make my lights go down when the switch is pulled out? Picture of it would be nice. Also, is there a diagram of the wires that go to the headlight switch, and colors. It's on a 1975. [/quote] If the wires on the plugs between the headlight motors and the harness is hooked up wrong, the light will go down when the switch is turned on. I don't have a 75 wiring diagram. The bird board used to have them up on it, but Porsche got pissy and made them take it down. You can go to the wayback machine and find them there. Clay [/quote] Long story short, the wires in that plastic clip, somehow, somewhere, someone, got them flip flopped. Lights now work, but having trouble with the left turn signals not working, and wipers not working, and hazards are 1/2 as bright? Odd thing is that I had gotten them wrinkles out from the previous X mechanic that had things all botched up. I mean like putting a foglight switch in place of a headlight switch. But the person I got it from, sent the wrong one, and I had sent it directly to him. Not sure what model it was. Also, didn't the 75-76 have a 3rd speed wiper, and the relay mounted on the DS cowl support? If so, that never got hooked back up, and I'm not so sure I don't have the correct wiper switch. I think my X mechanic got one that doesn't have that part where you push the lever down to activate it. Is there a diagram with colors and numbers that I could get for the headlight switch, and the 3rd speed wiper delay for a 1975? |
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Posts in this topic
ClayPerrine How your Headlight Motors Work. Nov 18 2004, 09:02 AM
ClayPerrine In the next picture we see the headlight circuit w... Nov 18 2004, 09:10 AM Root_Werks Cool! :trophy: Nov 18 2004, 09:11 AM ClayPerrine When the headlights are all the way up, the wiper ... Nov 18 2004, 09:13 AM ClayPerrine Now we turn the headlights off. The headlight swi... Nov 18 2004, 09:17 AM ClayPerrine I hope that clears up the mystery of how the headl... Nov 18 2004, 09:18 AM mikerose :clap: Thanks Clay :clap: Nov 18 2004, 09:27 AM dralf :clap:
Thanks,
At the moment I am not having pr... Nov 18 2004, 09:34 AM ppickerell Wow, you should try out for admin! ;) Nov 18 2004, 09:46 AM jfort this needs to go in Classics or whatever it is -- ... Nov 18 2004, 11:02 AM ClayPerrine Bump... updated to reflect the reality of the wiri... Nov 18 2004, 12:51 PM Gint Nice work Clay. Many thanks. Nov 18 2004, 12:52 PM chunger Sweet!
I was thinking about using an aftermar... Nov 18 2004, 03:17 PM Dave_Darling ...Is it just me, or are all three of those diagra... Nov 18 2004, 05:38 PM swood Great info! My lights go up and down and the ... Nov 18 2004, 07:05 PM Dave_Darling There is one fuse for each low beam element--two t... Nov 18 2004, 07:10 PM type47fan Dave, it's just you! Check the difference... Nov 18 2004, 07:29 PM
iankarr This may help…fwiw…I ended up wiring mine back... Oct 2 2021, 12:24 PM
ClayPerrine All 914-4s had a 2 speed wiper. There was an optio... Oct 2 2021, 06:32 PM |
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