Voltmeter Wiring Diagram Ford. 2004 mercury sable fuse box diagram. That really only leaves a few wires under the dash to worry about.
Use a quality tool to avoid over crimping. Attach an 18 or 20 awg jumper wire from the negative coil terminal to an engine ground. Start with the speakers and where they are located.
Using a voltmeter set to ac volts and the engine running full throttle check the voltage on each of these wires.
2004 mazda rx8 fuse box diagram. Check if your one is having the same issue or not. Using ford factory wiring harnesses is an option for most engines and projects. Reconnect the battery before continuing with the tccm module still disconnected.