Engine bay wiring is very minimal when it comes to a 60’s era muscle car. There is a handful of subsystems in the engine bay, such as windshield wiper circuits, brake fluid level sensor circuit and a few others. And of course, we have the minimal connections to the engine itself. We felt pretty confident that this will be a two to three hour project of research, preparation and completing the rewire routing project.
For our Camaro, we wanted to replace any crusty, frail or corroded wires. We will eventually upgrade to a PAINLESS wiring replacement, but for now we just did a minimal restore and routing for the wiring harness.
We wanted to keep it simple and replace damaged wiring first of all. We also checked all wires with voltage drop tests and circuit load tests for high current circuits, such as starters.
A circuit load test checks if the wire has good power and ground for the circuit to complete its travel leading to the activation (Ex. Windshield wipers or an HVAC blower motor). Having a poor power or ground issue could cause dim headlights, slow cranking for the starter motor or something else related with low voltage.
Isolating the circuit from point A to point B is very controlled and safe to diagnose electrical issues. The possibility of damaging electrical components is low using this method.
1.) Disconnect ground from battery power first and foremost.
2.) Hook up your DVOM and load indicator tool in series on the ground side for step two.
3.) Apply power to the circuit, then also check the value on the DVOM.
4.) Lastly, apply a voltage/current to the circuit to check measurements.
* Voltage drops across components should be around .2 volts. However, checking manufacturer specifications is recommended to confirm.
We never had an issue with wiring until recently, with rodents nibbling on the harnesses in the trunk. However, the wiring is 50+ years old and we just feel better knowing the wiring is fresh and placed without stress points and with enough slack for movement.
The engine compartment wiring turned out pretty good and we are looking forward to setting up the MSD HEI distributor.