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I looked at the other ones. The advantages to the way I did it are few but important. The truck can be off, it can also be in motion and the lights will still strobe.

Wicked warnings https://www.wickedwarnings.com/product/wicked-warnings-auto-flasher/ Used this to strobe marker lights and reverse lights only. I didn't want to lose my brake lights when strobes were active.

Here is my solution.