what is the load current? using SPDT means one of the switches would need to handle current of both loads.

 

Hi John,

Here's the schematic.



Please note that the relay 'NO' output terminal is # 87.



The switch should be capable of handling the current drawn by the rear LED lights.

Nandu.

 

If the mini switch is rated at 3A 250VAC, does that mean on 12VDC it technically should be able handle higher than 3A? Although combined both my LEDs are probably less than that

If you wire it like I've shown in post #6, you can use any low voltage/current SPST switch and a standard automotive relay.

 

If you wire it like I've shown in post #6, you can use any low voltage/current SPST switch and a standard automotive relay.

The current rating of a switch is related to the contact resistance and the resultant heating effects, so it is rather independent of the voltage. The voltage rating is related to the contact spacing in the open condition, and the insulation. It is also affected by the sparking when the switch opens under load.
For a switch that is not opened or closed with the power on and current flowing , the current rating will be the same, no matter the voltage.

 

The current rating of a switch is related to the contact resistance and the resultant heating effects, so it is rather independent of the voltage. The voltage rating is related to the contact spacing in the open condition, and the insulation. It is also affected by the sparking when the switch opens under load.
For a switch that is not opened or closed with the power on and current flowing , the current rating will be the same, no matter the voltage.

In my post, the switch is controlling the relay (like it should be anyway), not the load directly.
So the voltage/current rating for the switch can be small (since that seems to be of concern in previous posts).

 

If you wire it like I've shown in post #6, you can use any low voltage/current SPST switch and a standard automotive relay.

Hi eetech00,

Terminal #87a is the 'NC' contact and terminal #87 the 'NO'.

Wired as per post #6, both front and rear lights will be on even without the relays being energised.

Nandu.

 

Wired as per post #6, both front and rear lights will be on even without the relays being energised.
Nandu.

DRL lights don't need to be manually turned on (at least not on my vehicle).

So if IN1 (DRL) is active, then FRONT/REAR are both on (DRL for both), unless REAR is switched to normal by energizing RELAY2.
If RELAY2 is energized, then the REAR lights are controlled in a non-DRL manner via IN2.

Anyway, the circuit can be easily rearranged however the TS wants.
My intent was to show that the switch should really be used to control a relay, instead of directly controlling the load.