Autopia.org - View Single Post - What do you think of super halogen bulbs? (Silverstar, etc.)

PedroDaGr8 · 06-17-09, 07:02

Chops, 9007 bulbs are dual filament bulbs. So unless you have a new housing to use, you will HAVE to use 9007 bulbs. Also, since it is dual filament the previous schematic will need some adjustting to work for you.

To make matters worse, unfortunately, dual filament circuits are a bit harder to design as there are two types (positive switched and ground switched) for each bulb type. It appears with your particular bulb type most are positive switched but a few are ground switched.

If you can give me your vehicle model and year I will see what I can find and draw up a modified schematic for you. It isn't too hard.

As to what is the difference between positve switched and ground switched:

Positve switch : The three pins are Low beam 12V, High beam 12V, Shared ground
Ground switch: The three pins are Low Beam ground, High beam ground, shared 12V.

It is pretty easy to test if you have a multimeter. Just pull one of your plugs out and test the voltage difference between the pins and a ground. If the live pin moves between low and high beam, usually that means your setup is positive switched, if it stays the same, likely you are ground switched. I have seen the occasional ground switched system that makes the ground NOT in use 12V. If THAT is the case, then you will see TWO pins that have 12V.

Just let me know if you want me to make a schematic for you.

06-17-09, 07:02	#14 (permalink)
PedroDaGr8 Registered User PedroDaGr8 is offline Join Date: Oct 2006 Location: Lexington, KY Posts: 96	Re: What do you think of super halogen bulbs? (Silverstar, etc.) Chops, 9007 bulbs are dual filament bulbs. So unless you have a new housing to use, you will HAVE to use 9007 bulbs. Also, since it is dual filament the previous schematic will need some adjustting to work for you. To make matters worse, unfortunately, dual filament circuits are a bit harder to design as there are two types (positive switched and ground switched) for each bulb type. It appears with your particular bulb type most are positive switched but a few are ground switched. If you can give me your vehicle model and year I will see what I can find and draw up a modified schematic for you. It isn't too hard. As to what is the difference between positve switched and ground switched: Positve switch : The three pins are Low beam 12V, High beam 12V, Shared ground Ground switch: The three pins are Low Beam ground, High beam ground, shared 12V. It is pretty easy to test if you have a multimeter. Just pull one of your plugs out and test the voltage difference between the pins and a ground. If the live pin moves between low and high beam, usually that means your setup is positive switched, if it stays the same, likely you are ground switched. I have seen the occasional ground switched system that makes the ground NOT in use 12V. If THAT is the case, then you will see TWO pins that have 12V. Just let me know if you want me to make a schematic for you.