head lights pulse after bypassing my bulkhead

I know this is a old thread but, I have been battling this issue ever since I made the first post about it here. A LONG time ago. I wanted to post an update about it because, last night... I fixed it!!!

After changing voltage regulators, altenators, starter relays, cleaning grounds, adding grounds, changing the headlight switch, dimmer switch, instrument cluster voltage regulator, and much more, pretty much everything I could think of... I finally pulled the wiring harness out of the engine bay and did a complete amp meter bypass following the Mad Electronics instructions.

I put the wiring back in last night and fired it up... The lights still strobes. Exactly as before. I was about to pull my hair out.

As I was about to list the darn thing for sale it dawned on me... One last thing I had not considered. I have 3 autometer gauges. The gauges are wired in to "keyed on" power but, the back lights for them are not. They are wired in to come on when the headlights/driving lights do.

So, I unplugged the gauges from their "keyed on" power and it made no difference. I plugged them back in and unplugged the lights from the headlight circuit and the strobbing went away! Gone. I plugged them back in and it came back. So, I removed the bulbs from the sockets one at a time and when all 3 were removed... It went away.

Since I am going to be adding a volt meter to this collection... I have to ask... How do you guys wire the lights in to multiple gauges so they come when you turn your headlights on? Because, I clearly did it wrong.