For a stock 67 cougar, Circuit #262 brown wire needs to be connected to the I post on the starter solenoid (assuming of course the PO didn't hack the entire ignition circuit which we know the PO has done in the past since you say there is no circuit #32). Circuit #262 will be powered from the Starter solenoid directly when cranking the engine.Hey there,
I have a 67 base that is fairly new to me, i've just completed an entire engine rebuild and along the way added electric fans and a new DUI - hei distributor.
Finally got everything ready to go for cam break in and I haven't been able to get a start as wired... My fans and HEI are run off of separate relays from the back of the ignition switch 12v post. Everything seems to work as it should when key is in ON and ACC but when I go to crank the engine voltage drops to 0 at my HEI and my gauges / lights all die. The starter however does crank over...
I managed to complete cam break in by just adding a jumper wire from battery terminal to the distributor BATT directly, like this it all runs perfectly.
I'm at a bit of a loss as to what might be causing my voltage drop when cranking? Any thoughts?
Bad ignition switch? Bad ground somewhere?
My starter solenoid does not have wire 32 (Blue / Red) connected to the S terminal, PO had cut it somewhere along the harness. The car did run however prior to me pulling the engine for rebuild...
Thanks for any help!! Will try to fetch some pictures when i'm back at my garage Monday.
Circuit 262 then goes back to the firewall where it connects to the ignition circuit's #16 (red-green) which goes to the coil, providing power when starting. (Note: the power draw by the starter motor consumes 100+ amps and thus power provided to the I circuit will measure roughly 9 volts, not 12 volts. This is why the resistance wire is bypassed during starting and not to give a brief 12 volt jolt to the ignition systems when starting!!!!)
When the car starts and you return the ignition switch to the "Run" position, power to the coil is now provided via the ignition switch C or I post on circuit #16A at a reduced voltage of 8 to 9 volts. If you have an XR7, the power from the resistance wire goes to the Tachometer then to the firewall. If you do not have power at the coil in run position with an XR7, place a bypass wire across the tachometer and retest for power at the coil. Note if the car is running, and you put a Voltmeter on the Starter solenoids I post, you will also read 8 to 9 volts because the wires are all connected at the firewall thus backfeeding power from the resistance wire.
Now after re-reading your original post, you should have wired your HEI relay to the C (or I post) because the switch connects the battery power to both the Start and Coil when starting. The Accessory post is only connected to the battery when in Run or Accessory mode. You may want to try this first especially if the circuit #262 is missing at the starter terminal as described above.
Once you figure out what works for your situation, do yourself a favor, document how you wired the relays to the ignition and which wires were removed from the starter solenoid from a stock system AND put it in your glovebox. This way should you need to work on your ignition system in the distant future (hey I'm certain you will get your Cougar running) or the next caretaker of your Cougar will know exactly how your car is wired and why!!!