Oh, and so you know, intermittent issues can be a bear to trace down some times. If you want to restore the original performance of your vehicles ignition system, this product is what you need. 69 up had the ignition switch down on the steering column and 68 and older had it in the dash. Moving the ground from the battery for one test and then grounding it to a spot under the dash may show a voltage drop but it could be on the ground side.This is why it's important to keep the ground in one spot like the battery. Chevy El Camino 1968, Ignition Starter Switch by Standard®. You will notice a little drop the further you get away from the battery and this is normal and could add up to enough to prevent a no crank situation but there might be a spot or two the voltage really drops and then I would concentrate in those area's to find the issues.Īlso too, reference your meters ground to one point such as the battery. When the switch is in the run position the IGN-1 terminal is activated and sends 12 volts to the ballast resistor mounted on the firewall. Now out of the ignition switch is the crank wire and depending on the car, there may or may not be a safety switch and regardless if there is a switch,power needs to pass through it and then back out of the firewall bulkhead connector to where back in the engine compartment this wire then goes down to the starter solenoid.Īs you can see there are a few connections between the battery and the starter solenoid so I would get out your voltmeter and start at the battery with tests with the car off then cranking and then work your way through the circuit ending up at the starter solenoid. 3 Engine wiring diagram-1968-70 all L6 and V8 engines Fig. 1 Sample diagram-how to read and interpret wiring Fig. On the horn relay bus there is another wire connected to it and this wire then goes to and through the firewall bulkhead connector and then once inside this wire then gets split again with a wire going to the ignition switch (and another leg going to the fuse block and another to the headlight switch but here again too, should not be of concern with your issue). Access our free Wiring Diagrams Repair Guide for Chevrolet Full-size Cars 1968-1978 through AutoZone Rewards. From there a wire then goes into a loom with inside the loom has a splice in it to allow extra legs or wires to come out with one wire going to the horn relay bus (and the other leg goes to the output post of the alternator and the last leg to the external voltage regulator which in your case are in no need to be concerned about). Also watch out for any service bulletins that may have been performed on your car.īasically you have 12V coming out of the battery going through a fusible link wire to a junction stud on the backside of the radiator support. Click to expand.Ideally get a diagram out of a factory shop manual.
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