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With switches, that refers to Single Pull Double Throw or Double Pull Double Throw. It is all about the internals of how the switch works, and how the contacts are set up on the back.Can anyone explain further into different switches and thier installation. Maybe some info on momentary, SPDT, DPDT, and the like?
In the simplest case, a switch has two conductive pieces, often metal, called contacts that touch to complete (make) a circuit, and separate to open (break) the circuit.
A pair of contacts is said to be "closed" when current can flow from one to the other. When the contacts are separated by an insulating air gap, they are said to be "open", and no current can flow between them at normal voltages.
Switches are classified according to the arrangement of their contacts in electronics. Electricians installing building wiring use different nomenclature, such as "one-way", "two-way", "three-way" and "four-way" switches, which have different meanings in North American and British cultural regions as described in the table below.
In a push-button type switch, in which the contacts remain in one state unless actuated, the contacts can either be normally open (abbreviated "n.o." or "no") until closed by operation of the switch, or normally closed ("n.c. or "nc") and opened by the switch action. A switch with both types of contact is called a changeover switch. These may be "make-before-break" which momentarily connect both circuits, or may be "break-before-make" which interrupts one circuit before closing the other.
The terms pole and throw are also used to describe switch contact variations. The number of "poles" is the number of separate circuits which are controlled by a switch. For example, a "2-pole" switch has two separate identical sets of contacts controlled by the same knob. The number of "throws" is the number of separate positions that the switch can adopt. A single-throw switch has one pair of contacts that can either be closed or open. A double-throw switch has a contact that can be connected to either of two other contacts, a triple-throw has a contact which can be connected to one of three other contacts, etc.
These terms give rise to abbreviations for the types of switch which are used in the electronics industry such as "single-pole, single-throw" (SPST) (the simplest type, "on or off") or "single-pole, double-throw" (SPDT), connecting either of two terminals to the common terminal. In electrical power wiring (i.e. House and building wiring by electricians) names generally involving the suffixed word "-way" are used; however, these terms differ between British and American English and the terms two way and three way are used in both with different meanings.
SPST Single pole, single throw
An example is a light switch.
SPDT Single pole, double throw
A simple changeover switch: C (COM, Common) is connected to L1 or to L2.
DPST Double pole, single throw
Equivalent to two SPST switches controlled by a single mechanism
DPDT Double pole, double throw
Equivalent to two SPDT switches controlled by a single mechanism: A is connected to B and D to E, or A is connected to C and D to F.
This is a pretty good write up that details a lot of the wiring issues you may run into if you're working on the blinkers/marker lights.Great sticky!
I'm a complete retard when it comes to electrical wiring. I have a multimeter but I don't even know how to use it properly.
Question 1 - For signal light wires, how do you identify the purpose of each wire (without diagrams)?
Example - The front turning signal light is composed of 3 wires. I'm guessing 1 is the ground, 1 is the power for the signal light (to make it flash) and the remaining is the power for running lights (stays lit when you turn your lights on).
Question 2 - Based on the above signal light (and the wires being identified), if I wanted to hook it up to a new light (like the picture below) and it only had 2 wires (I'm guessing 1 positive & 1 ground) does this mean that I the new light can only have the function of either (a) signal (flashing) or (b) as a running light, but not both?