Now that the structural changes are done on my GT interior, I'm moving on to wire in the turn signal, ignition and wiper switches. It makes my brain ache to study the wiring diagrams from my '71 914 (early 12 pin harness), and the 1971 911 and 914-6 diagrams. Differences between them all and I'm a less than proficient electrician.

Here's a chart I made for the turn signal and ignition connections (thanks to Jeff Bowlsby, Clay Perrine and Tom Butler for groundwork posts and advice):

https://docs.google.com/spreadsheets/d/1Hvk...dit?usp=sharing

My biggest remaining questions go to a couple wires from the 911 turn signal harness that run outside the 914 12 pin connector.

I've labeled them in the chart above as position 15 and 16 (on the right). 15 is a red/white wire which runs from the switch bundled with the parking light wires, and from the 911 diagram it appears to be always on power connecting to the light switch. And 16 is a black wire coming back from the 6 prong plug. Can anyone confirm how they are used?

I'd be very appreciative of anyone who has put a 911 column in an early car helping me out. Am I on the right track or just smoking it?

Thank you,

John

Are all the 914 connections made in a logical fashion? Your Excel file is a wee bit difficult to easily grasp. If so, then ignore the left over wires from the 911 switch. Maybe this is a super stupid suggestion.

I think tge 924/944 turn signal switch is a minor change over

@morehills I made some minor edits since the last version I sent you, and is shown below to elicit any corrections or additions that need to be made.

Thanks,

Ken

Click to view attachment

Click to view attachment

Fabulous work Ken. I will start working with it this weekend and let you know if I run into any problems. This will be a huge aid to anyone doing a similar conversion. Thank you, John

Ken or perhaps others may have a thought on my final remaining wiring problem.

Everything works but my Hi/Low headlight beam switch. I think the high beams are engaged all the time. The switch is new and working properly.

I made a little video of the problem.

https://youtu.be/HFq81Gj-N8g?si=3rLewUQjYpVnPbzO

Perhaps this is related to the white/black SW56 wire that connected from signal control to position 56 on the light switch? When I connect that I get a loud buzz. I think it's coming from the headlight motor relay. I should add when I have the lights up it does not buzz. I've read somewhere else that the 914 flasher circuit cannot be used with the 911 switch, so I'm fine wiring this into my fog lights instead. But is it causing the hi/low beam problem.

Does anyone understand this circuit who can help me chase the wiring to make sure I've connected things properly?

Thanks so much. Frustrating as I'm almost there.

Best,

John

@morehills found a couple faux pas's...I sent you some PM's and will call you tomorrow.

Ken

@morehills here is the updated schematic drawing for your record that reflects revisions made to the high beam turn-on activation and high beam flash activation wires needed for the combination relay coil ground terminal.

Click to view attachment

Click to view attachment

Thanks,

Ken

Fantastic Ken. Everything works properly now and I can finish up the dash. I couldn't have done it without you. John

by buying a new bulkhead plug, soldering the pins and then installing it. We do it here all of the time

So it took a bit of time to sort through this but I finally made all my switches work properly. It turns out that the best approach is from the first diagram Ken posted in this topic.

Here are the key changes:

Connect the yellow wire from the turn signal control to the yellow input for the low beams at the fuse panel.

Remove the combination relay. The 911 switch does not use one and it confounds the switch when it's in place. The yellow/red wire attached to the relay becomes the high beam (white) wire and connects through to the the high beam input at the fuse panel (if doing it again, I'd make a white wire off the the 12 pin junction corresponding to high beam input from the turn signal switch). This white wire is married to the fog light blue white wire at the fuse input. Fogs work as intended in early car.

The white/black and red/white wires at the bottom of the diagram must be connected per the first diagram to the headlight switch.

If anyone has questions on this conversion for an early car please let me know and I will be glad to help out.

Now before all the wiring material is put away I'm going to set up a dual relay bypass for the headlights up int he frunk somewhere. Not exactly sure how I'll mount those. If anyone has a photo please PM me.

I suggest that you buy the JWest 911 headlight relay kit. It will do the same for a 914, but you have to extend the power wire all the way back to the battery.

https://www.jwestengineering.com/Early-911-...5-73-_p_15.html

Clay, I mounted up two JWest relays as you suggested, tied into to wiring harness right below the drivers side headlight bucket with a little mount. Quite easy in this position. I have some paint work and wire tidying up to do, but I'm very happy with the headlight performance. Much brighter with my C4s.