4-way issue

[FLFrank35]

You will need at least two diodes to make this work.

I used 3 Amp, 50 volt diodes with axial leads as they are inexpensive and readily available. Google pn# 1N5400.

The first diode needs to be installed up by one of the headlights (I did it on the drivers side) between the “Park” or “DRL” feed and the signal light feed. Why? Because these LED headlamps require power on BOTH the Park and signal feeds at the same time in order to give a yellow colour. With the key off there is no DRL power so you need some way to get power on this wire when the 4 ways are running. The diode will bring power from the left 4 way input and power both park/DRL inputs to give you the yellow colour. The diode must be installed with the stripe end on the Park/DRL wire.

The second diode needs to be installed in the Park/DRL feed up towards the connector for the front wiring harness. Why? To prevent feed back from the DRL’s to the rest of the electrical system, only when the key is off and the 4 ways are operating. So it needs to be in the harness ahead of where your Park or DRL feed wire splits from a single wire into one for each headlamp. You could also do it under the dash, just ahead of the connector for the front harness. This diode needs to be installed with the stripe end on the headlight side of this wire.

This is only necessary for those running DRL’s! For those who have connected the park and signal light wires together directly in their headlights this diode deal does not apply.

Pat, please forgive my inexperience. I'm a little confused when you say install a diode "between" the Park/DRL feed and the signal feed. Would that be the same as "from the harness to the lamp?" Do I just solder the diode in-line, wire on each end? Then heat-shrink?
And I ran a separate wire for the DRLs and did not connect/use the Park wire. I currently have yellow Turn and 4-ways (but the key needs to be ON).

Also, I'm not sure I understand "bring power from the left 4 way input and power both park/DRL inputs."

I appreciate the explanations! It's always better to know why/how something works.

Thank you for your help!
Frank