Does the heater use the AC compressor?
Your car’s HVAC system is very similar in that the A/C and heater are mostly separate from one another. The A/C uses refrigerant, while the heater uses hot engine coolant.
What happens if you run the heater and AC in your car at the same time?
Yes, it is useful, okay and won’t cause any damage. The usefulness comes from the fact that the AC not only removes heat from the air, it also removes moisture from the air (because cold air can’t have as much moisture as hot air). The removed moisture clears your windows quickly.
What is the common on a relay?
The COM (Common) connection of a relay is the part of the relay that moves. When a relay is off, the COMMON is connected to the NC (Normally Closed). The NO (Normally Open) connection of the relay is not connected until the relay turns on. It is possible to use Two relays to create a Normally Closed condition.
Can you break a relay?
If a relay is overloaded, it can burn out and damage the circuit or appliances connected to it. Be sure to choose a relay that can handle your voltage and current requirements to ensure the relay coil doesn’t burn out and your circuit doesn’t get damaged.
Does a relay need to be grounded?
The relay must be on the ground side of the load when the voltages above the coil are hot. The case should be grounded. The relay can be on either side of the load for hot switch voltages that are lower than the coil.
What is 85 on a relay?
Realizing that 85 and 86 are the coil pins, these pins will be transferring the current through the coil. 85 will be used to ground your relay, while 86 will be connected to the switchable power. 87 and 87a will be connected to your controlled accessories that you wish to turn on and off with your relay.
How many amps before you need a relay?
Most automotive relays are at least 30A (check the specs to make sure). This means they can transmit 30A without issue. The fuse holder you are looking at, however, cannot handle that much amperage. According to this wire chart 16AWG wire is only good to 18Amps @ 194°F (90°C).
Do LED pods need a relay?
If you are using a light pod that does not have a very large amp draw, you may not need a relay switch, but if you are using a larger LED light bar, they are a must have. It allows a low current “switch” circuit to control the electricity flow of a high-current circuit load, like your LED Light bar for example.