UKSaabs

THE site for UK Saab people!
It is currently Sun May 28, 2017 4:43 am

All times are UTC





Forum locked This topic is locked, you cannot edit posts or make further replies.  [ 3 posts ] 
Author Message
PostPosted: Wed Nov 18, 2015 8:19 pm 
Offline
Active user

Joined: Thu Sep 10, 2015 8:52 pm
Posts: 208
Car Model: '96 900iS Convertible
My mention of a mod to my car to change the backlight colours on the foglight switches (red for rear, white for front) got some interest in the Projects sub-forum.

As that forum is not for tutorials, I hope this post may be of use

When I converted my lights I used a stock of 3mm LEDs with internal resistors which can be powered directly from 12v. The types I used are relatively expensive and no longer seemingly available. This HowTo uses standard parts available off the shelf at Maplin

Image

Acceptable resistor range is about 850 ohm minimum - brightest - to about 1500 ohm max (dim). In theory at 12v you can go as low as 680 ohms with a modern LED but at 14v peak this is pushing your luck

Image

Image

Would be slightly brighter than the Saab standard filament bulb and use a fraction of the power, and last a lot longer, But nobody would ever know you'd gone to the effort of this conversion if you use green.

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Important note. The two bottom pins only power the light when the switch is switched off. If it doesnt light first time, press the switch!

_________________
Owner of 1996 Saab 900 iS Convertible since Aug 2015, my first Saab (6 non-Saab vehicles owned)


Last edited by DXMachina on Wed Nov 18, 2015 10:47 pm, edited 2 times in total.

Top
 Profile  
 
PostPosted: Wed Nov 18, 2015 8:33 pm 
Offline
Active user

Joined: Thu Sep 10, 2015 8:52 pm
Posts: 208
Car Model: '96 900iS Convertible
the Green and Amber test images are actually using a 5mm LED. It will - JUST - fit in through the gap, but I dont recommend it. Using an external resistor is pushing the limits of the space inside a Saab switch

If you want to do this you should put the LED in the bulb holder without a series resistor and cut into the loom negative lead to the lighting pins on the plug and put the resistor in series there. Dont put it on the positive feed as the light switches to a different, higher-voltage positive feed as the switch is turned on!" thats why they get brighter then.

_________________
Owner of 1996 Saab 900 iS Convertible since Aug 2015, my first Saab (6 non-Saab vehicles owned)


Top
 Profile  
 
PostPosted: Thu Nov 19, 2015 1:35 pm 
Offline
Full Pressure Turbo
User avatar

Joined: Mon Dec 23, 2013 10:17 am
Posts: 730
Car Model: '99 Viggen
Many thanks DXM, this is great stuff.

_________________
1999 9-3 Viggen
2017 Kawasaki ZZR1400 Performance Sport


Top
 Profile  
 
Display posts from previous:  Sort by  
Forum locked This topic is locked, you cannot edit posts or make further replies.  [ 3 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group

follow UKSaabs on Twitter



UKSaabs silhouette logo images by Mark Green www.greenphotos.com
"subsilver2" slightly bodged by UKSaabs for our own use.

:: Disclaimer ::
Comments posted here are the views of their individual authors and are not necessarily shared by the owners of this Web site.
Authors assume all responsibility for comments posted here.

UKSaabs The biggest and best privately owned UK based independent Saab forum for all SAAB enthusiasts.
Whilst we encourage our users to support our advertisers the site wishes to remain independent and therefore does not endorse any particular advertiser(s)
UKSaabs is not affiliated with Saab Cars UK or Saab Automobile AB