The only way this would happen is if the diode on the reverse switch LED is in backwards or shorted.If the hazard button is on, then pressing the reverse button illuminates both. And the same issue, if the winch switch is on, pressing the reverse button illuminates both.
Yes. With the reverse button off, the others work correctly. But the problem is the combination of that button with either of the others. I checked the diode with my meter on diode mode and it measures 0.9v in that direction and infinite in the other.If the winch switch is on and you press the Reverse switch does the winch LED come on also?
SG
Then the diode must be installed backwards.I checked the diode with my meter on diode mode and it measures 0.9v in that direction and infinite in the other.
I think, you need a Reverse Blocking Diode in EVERY new switch, including Winch.Almost, but the winch switch is still connected too. If the hazard button is on, then pressing the reverse button illuminates both. And the same issue, if the winch switch is on, pressing the reverse button illuminates both.
View attachment 171413
That makes perfect sense if the diode in series with the reverse switch LED is in backwards or defective.If the reverse and hazard buttons are both lit, and I switch the winch on, the hazard buttons gets dimmer and the reverse button gets brighter. This is a clue but I'm confused here.
Verify that all three diodes are OKAlmost, but the winch switch is still connected too. If the hazard button is on, then pressing the reverse button illuminates both. And the same issue, if the winch switch is on, pressing the reverse button illuminates both.
View attachment 171413
Where is this ( 4th ? ) Diode located ?Yes, plus one additional diode in series with the others leading to the dimmer.
That explains it. A 51B3 is a 5.1 volt zener diode. The band on a diode always indicates the cathode. Replace with a 1N4148.It's a 51B3
Wahoo !Yep with the new diode everything is working fine. I also added one to the winch switch for safety at your suggestion. Many thanks to both of you for helping figure this out.
I wonder if a simpler solution could have been to apply a high voltage to the button to burn out one of the LEDs, leaving the other intact.
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