Low Voltage on Dome Light / Dimmer Circuit? - JKowners.com : Jeep Wrangler JK Forum
 
LinkBack Thread Tools Display Modes
post #1 of 2 Old 07-11-2016, 10:15 AM Thread Starter
Rock God
 
illyb's Avatar
 
Join Date: Jul 2012
Location: MD
Posts: 683
Feedback: 0 reviews
Low Voltage on Dome Light / Dimmer Circuit?

I was installing some LED footwell / bed lights. I made the lights myself using some SMDs that I weatherproofed. Anyway ...

When I originally probed the dome light wire, I was pulling about 7.8V when the lights were off and about 12.9V when the dimmer switch on the column was set to "ON".

I spliced into the dome light circuit to power the lights, and began wiring up the lights. Once I had two of six strands of lights installed, I decided to test the setup. I turned the dimmer switch on, and the lights lit up. However, I had an issue with one of my solder joints, and the lights went out.

I fixed the bad joint, and have tested each strand of lights to ensure all are OK. All strands work when powered from a bench supply operating at 12V. However, when I try and power off of the dome light circuit now, the lights do not come on.

Now when I probe the dome light circuit, I get about 3.7V when the dimmer switch on the column is set to "ON". This is obviously why the lights do not come on any more, but the question is ... What is the cause of the low voltage on the dimmer switch circuit now?

Is there a protection function of the CANBUS that I am encountering?

As an electrical engineer, I am a bit confused as to why this would be happening.

Thanks mucho for the help...


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
illyb is offline  
Sponsored Links
Advertisement
 
post #2 of 2 Old 02-25-2018, 12:11 PM
Newbie
 
Join Date: Sep 2011
Age: 51
Posts: 7
Feedback: 0 reviews

Just curious if you found a solution, have had issues with my 12 jk dome lights. With no load, and switch on, i get 12 volts, hook a small led light to ii and voltage drops to @7, won’t even light an incadesent bulb, so I too am wondering now if there is some kind of protection in the circuit
Jayrh68 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JKowners.com : Jeep Wrangler JK Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome