Can we switch ground in relay
Table 1. Pin functions

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








simulate this circuit &ndash; 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.