Wiring Diagrams and Tech Notes
Wiring Tips
When making permanent electrical connections it is imperative that proper terminals, connectors and soldering be used. Using connectors such as MSD’s Weathertight or Deutsch connectors provide positive locking, sealed connections. Never simply “twist and tape” wires together. Faulty wiring will result in ignition and electrical problems
MSd power Cables
The Power Cables of the MSD Ignitions are the heavy (12 gauge) Red and Black wires. The Black wire connects to battery negative (-) or ground and the Red goes to battery positive (+). No switch or fuse should be used. The Red wire must be connected directly to the battery positive terminal or to the constant positive side of the starter solenoid.
Grounds
A poor ground connection can cause many frustrating problems. When a wire is specified to go to ground it should be connected to the battery negative terminal, engine block or a common solid ground on the chassis. Always connect the ground to a clean, paint free metal surface and always have a ground strap between the engine and the chassis. Do not rely on solid engine mounts as a ground between the chassis and engine.
Wire Lengths
The power leads and the wires of the MSD can be shortened, however the correct connectors should be properly installed and soldered in place. If the wires of your MSD Ignition are not long enough for your application, they can be lengthened if properly done. If lengthening the heavy Power Cables, the next size larger (10 gauge) must be used. For the 14 gauge wiring, use the same size or 12 gauge. Always take the time to solder and insulate these connections. Doing it right the first time will save you frustration later!
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