Majestic Moose

I'm finally putting together a guide for converting to LEDs. It is taking me longer than expected but I think I have the exterior covered and it might help someone. I welcome any questions, comments, or criticisms to make it better.
Let me know if the link works. I don't want to upload it to rennlist because they would own it as per terms of use. Once completed I will do a guide for S4s as well.

Converting to LED bulbs 78-86 rough draft 1.0

Randy V

Good for you.

Any recommendations for LEDs for the instrument cluster on later models?

Bedfordman

Thanks, I like this level of helpful detail. On easy stuff: I found the LED swap ( '91 S4 ) for the 5 Interior Lights and the 2 Door Guard Lights to be straightforward, no other modifications needed, cheap and a real improvement. And you can then leave the doors or hatch open without quickly running down the battery.

Majestic Moose

There is already the excellent guide from Ed Scherer that covers the digital dash: Converting Porsche 928 Interior Lighting to LEDs

Yes, I've forgotten the hatch unlatched for days and did not drain the battery.

Majestic Moose

I finally got around to finishing this guide with an interior section.

Converting to LED bulbs 78-86 rough draft 3.0

928NOOBIE

Perfect timing! Thank You!

murray928

This is fantastic. Many thanks.

rdc928

I just saw this today for the first time - thanks!

I've been following Ed's excellent '89 & up write up as far as I can with my '88 and hit a wall at the hazard flasher pod switch. After installing my resistors at the other three switches, I went to install the 1.8k ohm resistor in the bk/bl wire as per Ed's direction and found there are not one but TWO bk/bl wires, both joined to a common junction with a single receptacle. I assumed they take a single switch input and lead off to two separate circuits, so I found myself faced with a mystery: did Ed know about this and not mention it, or did it no longer exist in the '89? I spent several moments trying to decide whether to insert a single common 1.8k resistor that served both lines, or to insert two separate 1.8k resistors (one for each line), or to insert only one resistor in only one of the lines, which would have to be selected at random.

I finally decided to punt, hoping to come back to it once I had an answer. I'd welcome any suggestions!

rdc928

PS - Thanks especially for the dash panel polarity diagram - I've looked everywhere for this and thought I had found it in a 944 forum, but unfortunately the indicator layout was just too different. I'll be interested to see if your diagram works for the '88.

Majestic Moose

That was a head scratcher, I flat out did not remember. Looking at the wiring diagrams, my 1983 has paired bk/bl wires too for the hazard switch. I found a post that depicts the solution very well, here.

rdc928

That's fantastic -- thank you -- especially for your robust forum search skills. :-)

928 DesMoines

Misposted

bureau13

Regarding that Hazard switch wiring and the associated LED behavior, with the lights on and the hazards off, should the switch LED be on bright or on dim? I thought it was supposed to be dim...a passenger in my car thought it was indicating a hazard of some sort lol because it's definitely on bright. So I assumed I screwed something up with the resistor, but now that I'm taking a second look, I did exactly as the diagram above suggests. Maybe I'm just mistake about what the behavior should be.

Majestic Moose

Yes it should be dim unless the switch is activated. What resistor have you used?