diff --git a/src/Relays/Relays.c b/src/Relays/Relays.c
index e10ee88..6c468d0 100644
--- a/src/Relays/Relays.c
+++ b/src/Relays/Relays.c
@@ -6,3 +6,15 @@
  */
 
 #include "Relays.h"
+
+void Relay_MeasureMakeTime(Relay *relay) {}
+
+void Relay_Enable(Relay *relay) {
+  if (relay->disabled_fpc) {
+    return;
+  }
+
+  (*(uint8_t *)relay->output_port) |= (1 << (relay->output_pin));
+}
+
+void Relay_DisableForPowerCycle(Relay *relay) { relay->disabled_fpc = true; }
diff --git a/src/Relays/Relays.h b/src/Relays/Relays.h
index d25b347..136c4c7 100644
--- a/src/Relays/Relays.h
+++ b/src/Relays/Relays.h
@@ -10,18 +10,20 @@
 #ifndef RELAYS
 #define RELAYS
 
+#include <stdbool.h>
 #include <stdint.h>
 
 /**
  * Represents an individual relay.
  */
 typedef struct Relay {
-  uint8_t output_port;
+  void *output_port;
   uint8_t output_pin;
-  uint8_t input_port;
+  void *input_port;
   uint8_t input_pin;
   uint16_t make_time;
   uint16_t break_time;
+  bool disabled_fpc;
 } Relay;
 
 /**
diff --git a/tests/Relays/test_Relays.cpp b/tests/Relays/test_Relays.cpp
index 8dca280..b00396f 100644
--- a/tests/Relays/test_Relays.cpp
+++ b/tests/Relays/test_Relays.cpp
@@ -12,20 +12,61 @@ extern "C"
 #include "Relays.h"
 }
 
+void zero_relay_struct(Relay *relay)
+{
+    relay->input_pin = 0;
+    relay->output_pin = 0;
+    relay->break_time = 0;
+    relay->make_time = 0;
+    relay->disabled_fpc = false;
+    *(uint8_t *)relay->output_port = 0x00;
+    *(uint8_t *)relay->input_port = 0x00;
+}
+
 TEST_GROUP(test_Relays)
 {
+    uint8_t fake_input_port;
+    uint8_t fake_ouput_port;
+    Relay relay;
+
     void setup()
     {
-
+        relay.input_port = &fake_input_port;
+        relay.output_port = &fake_ouput_port;
+        zero_relay_struct(&relay);
     }
     void teardown()
     {
-
+        fake_input_port = 0x00;
+        fake_ouput_port = 0x00;
     }
 };
 
-TEST(test_Relays, FirstTest)
+
+TEST(test_Relays, CreateRelayStruct)
 {
-   FAIL("Fail me!");
+    CHECK(relay.input_port == &fake_input_port);
 }
 
+TEST(test_Relays, DisabledForPowerCycleSetsDisabledBit)
+{
+    Relay_DisableForPowerCycle(&relay);
+    CHECK_TRUE(relay.disabled_fpc);
+}
+
+TEST(test_Relays, EnableSetsCorrectPinsInPort)
+{
+    for(uint8_t i = 0; i <= 7; i++) {
+        zero_relay_struct(&relay);
+        relay.output_pin = i;
+        Relay_Enable(&relay);
+        CHECK_EQUAL((1<<i), *(uint8_t *)relay.output_port);
+    }
+}
+
+TEST(test_Relays, EnableDoesNothingOnPCDisabledRelay)
+{
+    Relay_DisableForPowerCycle(&relay);
+    Relay_Enable(&relay);
+    CHECK_EQUAL(0x00, *(uint8_t *)relay.output_port);
+}