 Need a little assistance, What the heck? |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
  |
| Flyinlow |
 Jan 29 2026, 05:29 PM
Post
#1
|
|
Flyinlow  Group: Members Posts: 113 Joined: 17-October 20 From: British Columbia, Canada Member No.: 24,774 Region Association: Canada 
 |
74 2.0 project nearing completion testing things out then….hook up battery headlights go up but not on switch on lights close and turn on also-brake lights on when key on… got something wrong
|
   |
 
|
| bkrantz |
Jan 29 2026, 07:32 PM
Post
#2
|
|
914 Guru Group: Members Posts: 8,587 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains
|
Did you unplug all the leads on the fuse panel during the rebuild?
|
|
|
|
| bkrantz |
Jan 29 2026, 07:34 PM
Post
#3
|
|
914 Guru Group: Members Posts: 8,587 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains
|
Check the brake pedal switch. From memory, it has a lever that is pushed to open the circuit when the pedal is at rest.
|
|
|
|
| Spoke |
Jan 29 2026, 11:17 PM
Post
#4
|
|
Jerry Group: Members Posts: 7,330 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
|
QUOTE(Flyinlow @ Jan 29 2026, 06:29 PM)  hook up battery headlights go up but not on switch on lights close and turn on This is the circuit for the headlight motors. It sounds like the wires to the headlight motors is reversed likely at the headlight switch.  |
|
|
|
| Flyinlow |
Jan 29 2026, 11:39 PM
Post
#5
|
|
Flyinlow Group: Members Posts: 113 Joined: 17-October 20 From: British Columbia, Canada Member No.: 24,774 Region Association: Canada
|
QUOTE(Spoke @ Jan 29 2026, 09:17 PM) QUOTE(Flyinlow @ Jan 29 2026, 06:29 PM) hook up battery headlights go up but not on switch on lights close and turn on This is the circuit for the headlight motors. It sounds like the wires to the headlight motors is reversed likely at the headlight switch. Anyone have a pic or a layout for that switch?theres a lot of wires on it I do not recall unplugging any |
|
|
|
| Spoke |
Jan 29 2026, 11:50 PM
Post
#6
|
|
Jerry Group: Members Posts: 7,330 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
|
Here's a thread with info on the headlight switch connections.
Seems like the wires on 30B and 56K are reversed. 1974 Headlight Switch pinout |
|
|
|
| Spoke |
Jan 30 2026, 12:08 AM
Post
#7
|
|
Jerry Group: Members Posts: 7,330 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
|
A fuzzy schematic showing the connections for the motors at the headlight switch.
 |
|
|
|
|
2 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
1 Members: Aerostatwv
|
Lo-Fi Version | Time is now: 30th January 2026 - 07:12 AM |
Invision Power Board
v9.1.4 © 2026 IPS, Inc.