|How to Connect 12V Accessories in Your UTV
Whether you are going to connect a set of HID lights, heated seats or a stereo in your UTV, there are a few things you should know before trying to hook them up.
How much can you connect to your UTV?
Each UTV can handle different amounts of 12V load. The charging system on UTVs is handled by a stator. A stator’s output varies by RPM of the engine. Higher RPM will produce more charging output.
watts/amps=volts or volts x amps=watts
Can’t I just tap into the factory wire for my headlights?
How much do typical accessories draw?
HID Lights – 35W is about 3 amps
Halogen Lights – 50W is about 4 amps and 100W is about 8 amps
Heated Seats – 3.7 amps each
Do I need to use a relay?
Anytime you want to switch and accessory which draws more current than is provided by an output of a switch, your should use a relay.
How do relays work?
A relay allows a very low current signal to control a very high current device. A relay can be triggered with an electrical pulse as small as 150 milliamps. The switched output can be as high as 30 or 40 amps.
Pins 86 and 85 trigger the internal switch to the relay. Basically, if you put 12 volts on on pin and ground on the other you will “throw the switch” inside the relay. Once the switch is triggered, 12V is sent from pin 30 to pin 87.
Pin 85a is normally closed, and will see power from pin 30 when the switch is not triggered. The accessories we’ll be looking at don’t need 85a, so we won’t cover it anymore.
Painless Wiring does make a general purpose auxiliary light relay kit, but you have got to figure out how to make it all work right for your particular application. They also sell fuse blocks. But the best product I have found that is relatively inexpensive, and makes connecting lights to switches a breeze is made by Autotrend. In one simple package, I get two 2 relay controlled 30 amp outputs and 2 fused 12v outputs, along with two switches and pre-made wiring harness that makes it all super simple.
Example Autotrend Fuse/Relay Block Installations:
The Autotrend fuse/relay block comes with:
Telephone: (530) 642-0999
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