All 4 on Hi Relays Not Working

[Big T]

I get Lo beams. I get Hi beams. But the All 4 on Hi stopped working. Checked fuses in both relays and they're fine. I'm running HIDs in Lo and Hi, so this All 4 on Hi is a needed function.

 

[MrMarty51]

relay must have gone bad, or a bad connection.

 

[Twisted Steel Performance]

I bet their is a diode in the wiring somewhere that triggers the low side when high is on, bet it's blown... I know this because I had a new harness built and I have replaced the diode in the past...

 

[THEFERMANATOR]

Blown diode from the high beam to the low beam relay.

 

[MrMarty51]

I wired the high beams, through a relay to the low beams. No diode was needed.

 

[THEFERMANATOR]

I wired the high beams, through a relay to the low beams. No diode was needed.

You can, but when you do, it puts the load of all the lights on 1 relay, and that is not an ideal setup. A cheap diode does the trick, and keeps it so the relay's are only poweri,g 2 lights at a time.

 

[MrMarty51]

You can, but when you do, it puts the load of all the lights on 1 relay, and that is not an ideal setup. A cheap diode does the trick, and keeps it so the relay's are only poweri,g 2 lights at a time.

I`ll have to check it out. i was thinking with the high beam for the signal and the low beams bulbs hooked through the load side of the relay, it`d be powering just the low beams.

 

[THEFERMANATOR]

If you wire it so the lows are on 1 relay and the highs on a another relay, you normally use a diode from the high beam relay to the low beam for the all 4 on mod. Now you can also wire it so the high beam relay powers the floating pin of the low beam relay for the all 4 on, but this method has all 4 being powered off the high beam relay. Don't know of how else you could wire an all 4 on.

 

[Big T]

Cancel that. Found a ground that did not make it back on the battery post. All is good.

 

[Will L.]

Recheck the 4wd now with the “found” ground.

 

[Big T]

Recheck the 4wd now with the “found” ground.

It was the ground from the All 4 on Hi relay.

4wd is working, just no 4Lo and that has been out for years.