DRL + HID Bad on 2007 and Up Balts? - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Interior & Exterior Styling Talk about Chevy Cobalt interior and exterior products such as body kits, spoilers, steering wheels, shift knobs, etc.

Closed Thread
 
LinkBack Thread Tools Display Modes
post #1 of 17 (permalink) Old 04-20-2012, 08:07 PM Thread Starter
Expert
 
Join Date: Aug 2009
Posts: 924
DRL + HID Bad on 2007 and Up Balts?

Hi all,

I think I know the answer to this already, but I would like to ask anyway.

So with the low voltage power to the headlights when DRL lights are on, if you have HIDs, this low voltage can reduce the life of your HID ballasts?

Just want to ask as I may be getting a newer cobalt so I can have two.

Old Car: Chevy Cobalt 2006 LS Sedan base (Automatic)

New Car: Chevy Impala 2011 LT Fully Loaded (Automatic)
johnccc is offline  
Sponsored Links
Advertisement
 
post #2 of 17 (permalink) Old 04-20-2012, 08:19 PM
Super Moderator
YourCobalt.com Premium Member


 
Coby7's Avatar
 
Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
Garage
You can buy a harness with relays that applies full voltage during DRL.

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

Never drive faster than your guardian angel can fly
Coby7 is offline  
post #3 of 17 (permalink) Old 04-20-2012, 08:24 PM Thread Starter
Expert
 
Join Date: Aug 2009
Posts: 924
That would save them, if this was in fact an issue, but I would not like my HIDs on 24/7

I know pulling the DRL fuse is the solution, but want to know does DRL voltage actually cause damage to your HID ballasts or other HID components?

Old Car: Chevy Cobalt 2006 LS Sedan base (Automatic)

New Car: Chevy Impala 2011 LT Fully Loaded (Automatic)
johnccc is offline  
 
post #4 of 17 (permalink) Old 04-20-2012, 08:26 PM
Super Moderator
YourCobalt.com Premium Member


 
Coby7's Avatar
 
Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
Garage
Yes, low DRL voltage will fry your ballast.

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

Never drive faster than your guardian angel can fly
Coby7 is offline  
post #5 of 17 (permalink) Old 04-20-2012, 08:38 PM Thread Starter
Expert
 
Join Date: Aug 2009
Posts: 924
Quote:
Originally Posted by Coby7 View Post
Yes, low DRL voltage will fry your ballast.
Thank you, exactly as I thought, whats your "estimate" on how long would it take to fry a ballast with low voltage DRL?

Lets put the time in hours of them on rather than days as we would have the depends on how much the car is on during the day.

Old Car: Chevy Cobalt 2006 LS Sedan base (Automatic)

New Car: Chevy Impala 2011 LT Fully Loaded (Automatic)
johnccc is offline  
post #6 of 17 (permalink) Old 04-20-2012, 08:40 PM
Super Moderator
YourCobalt.com Premium Member


 
Coby7's Avatar
 
Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
Garage
Probably won't make it out of the driveway.

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

Never drive faster than your guardian angel can fly
Coby7 is offline  
post #7 of 17 (permalink) Old 04-20-2012, 08:41 PM
Staff Alumni
 
Rriggs92's Avatar
 
Join Date: Mar 2012
Location: Fort Wayne, Indiana
Posts: 1,345
why would a low voltage fry it? kinda doesnt make sense to me..then again i dont have hids
Rriggs92 is offline  
post #8 of 17 (permalink) Old 04-20-2012, 08:51 PM Thread Starter
Expert
 
Join Date: Aug 2009
Posts: 924
Quote:
Originally Posted by Coby7 View Post
Probably won't make it out of the driveway.
So if somebody claiming they have a 2007 or up cobalt with HIDs and their DRL fuse still in (assuming their DRL is working too) were having no issues, would they be mistaken?

Quote:
Originally Posted by Rriggs92 View Post
why would a low voltage fry it? kinda doesnt make sense to me..then again i dont have hids
HID ballasts convert your average 12V VDC into a much higher voltage and are not simple circuits. To answer your question, I do not know why it fries them, as far as I know, usually this technology is called an inverter, but I'm not an electrician, I know basic electric, but not enough to understand why a low voltage could fry a circuit. Coby seems to know much about electricity, this is why I posted here. (I expected to get a reply from Coby first)

Old Car: Chevy Cobalt 2006 LS Sedan base (Automatic)

New Car: Chevy Impala 2011 LT Fully Loaded (Automatic)

Last edited by johnccc; 04-20-2012 at 08:59 PM.
johnccc is offline  
post #9 of 17 (permalink) Old 04-21-2012, 03:07 AM
Super Moderator
YourCobalt.com Premium Member


 
Coby7's Avatar
 
Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
Garage
The ballast has DC to DC converter. For explanation purposes let's say the arc voltage necessary is 600 Volts and that you have a 30 Watt ballast-bulb combination, this means the secondary circuit needs 50 ma to produce the arc. The DC to DC converter is design to maintain a steady constant voltage @+/-12Volts and has roughly a 50:1 current ratio @12 Volts. So this means you are drawing 2.5 amps from your battery, but if you reduce the voltage to 6 volts then the current ratio becomes 100:1 to maintain the 600 Volt output. Well you guessed it you have just doubled the input coil current to 5 amps which is twice the current that it was designed for. Since most people don't reduce the DRL fuse it doesn't burn but your ballast does.

Here is a simplified circuit without feedback.
Attached Thumbnails
Click image for larger version

Name:	HID_bal.jpg
Views:	204
Size:	29.0 KB
ID:	448  

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

Never drive faster than your guardian angel can fly

Last edited by Coby7; 04-21-2012 at 10:04 AM.
Coby7 is offline  
post #10 of 17 (permalink) Old 04-21-2012, 09:00 PM Thread Starter
Expert
 
Join Date: Aug 2009
Posts: 924
600 Volts "DC".

Damn, that's a lot of Volts, no wonder HIDs are so blinding, lol.

I would like to know if the solution I am about to suggest is plausible:

Opening up the BCM, like in your other thread, then change the DRL output to light up the ambers like on the older cobalts, it will still be 6 Volts, but to get 12V we can add an relay and use another power source, but is the idea itself plausible, regardless of difficulty?

Old Car: Chevy Cobalt 2006 LS Sedan base (Automatic)

New Car: Chevy Impala 2011 LT Fully Loaded (Automatic)
johnccc is offline  
Sponsored Links
Advertisement
 
Closed Thread

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



Posting Rules  
You may not post new threads
You may not 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