Hello! Log in or Register   |  Help  |  Donate  |  Buy Shirts  See all banner ads | Advertise on TheSamba.com  
TheSamba.com
 
1973 heat/defrost light
Forum Index -> Thing/Type 181 Share: Facebook Twitter
Reply to topic
Print View
Quick sort: Show newest posts on top | Show oldest posts on top View previous topic :: View next topic  
Author Message
Fs71
Samba Member


Joined: October 28, 2017
Posts: 9
Location: Boise, Idaho
Fs71 is offline 

PostPosted: Thu Nov 08, 2018 6:08 pm    Post subject: 1973 heat/defrost light Reply with quote

my 1973 heat/defrost light is extremely dim; so dim you can barely tell it is on. When I open it up and probe the interior with a test light ( if I hit the right spot ) the light becomes extremely bright. I am completing the ground with the test light. Any one have any ideas? How do I fix this?

Thanks
Back to top
View user's profile Send private message Send e-mail Classifieds Feedback
Dougster43
Samba Member


Joined: May 11, 2018
Posts: 28
Location: Texas
Dougster43 is offline 

PostPosted: Fri Nov 09, 2018 7:06 am    Post subject: Re: 1973 heat/defrost light Reply with quote

There is a resistor inside the case of the heat/defrost switch that is wired in series with the bulb on the positive lead. When you see it go bright you are applying power between the resistor and the bulb.

The fix for this would be to change to a resistor with a lower resistance value. As I recall, the stock resistor was 360 ohms. I know when I replaced the bulb I couldn’t even get the new bulb to light up. I tried several different resistors. For me, anything at 150 ohms or less made the bulb way too bright. I would have to verify but I think I wound up with either a 180 ohm or 220 ohm resistor to get the right brightness.

You would use a soldering iron to take out the old resistor and replace it with the new one.

Hope that helps.
Back to top
View user's profile Send private message Classifieds Feedback
Display posts from previous:   
Reply to topic    Forum Index -> Thing/Type 181 All times are Mountain Standard Time/Pacific Daylight Savings Time
Page 1 of 1

 
Jump to:  
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 vote in polls in this forum

About | Help! | Advertise | Donate | Premium Membership | Privacy/Terms of Use | Contact Us | Site Map
Copyright © 1996-2018, Everett Barnes. All Rights Reserved.
Not affiliated with or sponsored by Volkswagen of America | Forum powered by phpBB