i would never use only a switch. i always use a relay.
and don´t forget to install a fuse in the + cable as close as possible the battery.
X2. Bigger wire=less resistance. 12ga is fine but use a relay and fuse!
“He who knows not and knows not that he knows not, he is a fool, shun him.
He who knows not and knows he knows not, he is simple, teach him.
He who knows and knows not he knows, he is asleep, wake him.
But he who knows, and knows he knows, he is wise, follow him.”
89 yj 4 banger 5sp. 2" BL 31x10.50 fixed up and sold
97 tj 4.0 Auto 4"RC lift 33x12.50 mud rovers on outlaw IIs . Smitty bumpers
What exactly is a relay. I know what they look like and such, but mechanicaly what does it do. I assume that it is more than just a glorified fuse.
here's a picture and description complements of wikipedia.org
A protective relay is a complex electromechanical apparatus, often with more than one coil, designed to calculate operating conditions on an electrical circuit and trip circuit breakers when a fault was found. Unlike switching type relays with fixed and usually ill-defined operating voltage thresholds and operating times, protective relays had well-established, selectable, time/current (or other operating parameter) curves. Such relays were very elaborate, using arrays of induction disks, shaded-pole magnets, operating and restraint coils, solenoid-type operators, telephone-relay style contacts, and phase-shifting networks to allow the relay to respond to such conditions as over-current, over-voltage, reverse power flow, over- and under- frequency, and even distance relays that would trip for faults up to a certain distance away from a substation but not beyond that point. An important transmission line or generator unit would have had cubicles dedicated to protection, with a score of individual electromechanical devices. The various protective functions available on a given relay are denoted by standard ANSI Device Numbers. For example, a relay including function 51 would be a timed overcurrent protective relay.
These protective relays provide various types of electrical protection by detecting abnormal conditions and isolating them from the rest of the electrical system by circuit breaker operation. Such relays may be located at the service entrance or at major load centers.
Design and theory of these protective devices is an important part of the education of an electrical engineer who specializes in power systems. Today these devices are nearly entirely replaced (in new designs) with microprocessor-based instruments (numerical relays) that emulate their electromechanical ancestors with great precision and convenience in application. By combining several functions in one case, numerical relays also save capital cost and maintenance cost over electromechanical relays. However, due to their very long life span, tens of thousands of these "silent sentinels" are still protecting transmission lines and electrical apparatus all over the world.
Top, middle: reed switches, bottom: reed relay
Top, middle: reed switches, bottom: reed relay
An "Overcurrent Relay" is a type of protective relay which operates when the load current exceeds a preset value. The ANSI Device Designation Number is 50 for an Instantaneous OverCurrent (IOC), 51 for a Time OverCurrent (TOC). In a typical application the overcurrent relay is used for overcurrent protection, connected to a current transformer and calibrated to operate at or above a specific current level. When the relay operates, one or more contacts will operate and energize a trip coil in a Circuit Breaker and trip (open) the Circuit Breaker.
Keepin the peace.
The difference between sport and combat is that in combat you bury the one who comes in second.
Don't let all that scare you, in a nutshell all a relay is is a remotely operated switch, a fast one that is much faster than you can operate a manual switch.
So, the dash switch operates the relay and makes it go 'click'
Find a good spot in the engine compartment for one to fit. Me, I used some sheetmetal, bent it a bit and now have a horizontal spot to mount relays. I put it close to the PDC [that black box where the fuses are], I use the end of it to grab power though sometimes I've just used an empty fuse slot for stuff I want to turn off when the jeeps are turned off. I've almost exclusively used the Hella relays which have a built in fuse holder on them. Saves having a bunch of hanging fuses all over the place. When you mount the relays make sure you mount them pins down, otherwise you will get moisture inside, condensation actually, that will build up and short it out.