DRLs on with Parking Lights. It works. (Pics)

[Hummie2]

<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR> so I'm not sure why you are getting the 125mA reading, as the DRL's draw more than that, unless GM have found a way to defy Ohms Law.
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Phil...

Ohm's Law still applies, even for GM, as well as other rules for parallel circuits.

After the 10A fuse the DRL circuit becomes a parallel circuit with one circuit through the relay contacts through the bulb filaments to G100 ground. The other circuit goes through the relay coil to ground through the DRL control of the BCM or through the added diode to the Park Light control of the BCM, so actually the diode only carries 125mA of the total load.

The BCM could not handle the 54W load of the filaments, the reason for the relays, and the added diode becomes a one way street for the DRL relay coil to seek an additional ground when the park light circuit has continuity.

Don