Constant to Momentary 12V Output Relay Wiring Diagram - Capacitor & Resistor

This document is a small electrical schematic titled "Constant to Momentary 12v(+) Output," sourced from the12volt.com (visible watermark). It shows how to wire a standard 5-pin automotive relay (terminals 30, 85, 86, 87, and 87a) together with a 1K uf capacitor and a 10K fixed resistor to convert a constant switched 12-volt positive signal into a brief momentary 12-volt positive output pulse. In the diagram, a switched 12v(+) source feeds relay terminal 86, and a fused 12v(+) source feeds terminal 87. A 1K uf capacitor and a 10K fixed resistor are wired in parallel to ground on the terminal 85 side of the relay coil. The momentary 12v(+) output is taken from relay terminal 30. Wire runs are shown in different colors (magenta for the switched input, red for the fused input, green for the capacitor/resistor branch, and dark blue/violet for the momentary output). The diagram is generic and not tied to any specific vehicle make, model, or year; it is a common technique used in 12-volt automotive accessory installations (e.g., triggering devices that require only a momentary pulse from a constant signal). No part numbers, fuse ratings, or vehicle-specific data appear in the document.