Electronic – Can we switch ground in relay

12vrelaysolid-state-relay

I am having a 3 pin relay used in bike horns. My need is to turn on and off ground using the positive as trigger. That means the positive terminal of the device is connected to the 12v supply. Usually we are turn on and off positive using ground. I need the opposite. Is it possible? If yes i can connect it to the device. I don't have any test environment. So i have to confirm before going forward.

Best Answer

Table 1. Pin functions

 Terminal/Pin number
 85 Coil
 86 Coil
 87 Normally Open (NO)

schematic

simulate this circuit – Schematic created using CircuitLab

Figure 1. Using a 3-pin, 12 V relay to use a switched positive signal to control a switched negative load.

For more on auto relays see 12 volt planet.