Thread: 6v DRL?
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Old 08-03-2016, 05:48 AM   #5
fdryer
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Join Date: Jan 2006
Location: NYC
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2003 L-Series 3.0L Sedan
Default Re: 6v DRL?

The main confusion about GM's method to address and incorporate daytime running lights while sidestepping HID lighting is this; GM simply uses plain electrical fundamentals, series and parallel circuits with relays, light sensors and electronics to control automatic daytime running lights, switching to night time full power lighting without having to manually turn on headlights. To accomplish this feat was simply using a series wired configuration not used in normal headlight wiring. Series wiring simply means wiring two electrical components together, in this case the two high beams, in series by connecting one light connection to the battery, the other wire to the second headlight wire and the second headlight wire to ground. Series wiring simply reduces the current to both headlights since they're electrically resisting battery current. This is not normal headlight wiring. All headlights are wired in parallel where each headlight is wired to have 12v. Below is a simple series and parallel circuit. The drl lights do not have 6 volts as you may imagine. It's more about impeding battery current flow that reduces current that GM uses to allow daytime running lights without burning out headlights from drl use. Reducing current to each headlight in drl use doesn't shorten the life of halogen lamps and ideally incorporated here. HID lights cannot run in a series circuit with many attempting to convert to HID light while using the drl circuit blame wiring or cheap HID kits when its not wiring or HID's but lack of knowledge in basic electricity.

To fully understand series and parallel wiring also requires reading and understand wiring schematics.

HID lights only work as 12v lighting systems and cannot work in GM's series/parallel headlight systems. The series circuit in drl mode simply fails to provide full 12 volts to HID lights wired in series. If the headlight were manually switched on, the drl mode is switched off and parallel wiring is in place to supply the same HID light with 12v to each ballast as in normal headlight wiring (parallel).
Attached Images
File Type: jpg series.jpg (26.6 KB, 2 views)
File Type: jpg parallel.jpg (36.1 KB, 2 views)

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