Question on going manual on '84 Glow Controller

[BobQ]

Had a quick question on adding a manual button to activate the glow plugs on our '84 6.2L. It still has all of the stock '84 controller and relay in place. I want to just abandon the glow controller in the cylinder head and use a manual button. Can I leave everything as-is and then just add a button with one side going to a keyed 12V source and the other side of the button going to the S terminal on the relay? Do I need to run a ground wire from the I terminal on the relay to ground as well? I'm currently running AC Delco 60G glow plugs as well.

Thanks.

[DmaxMaverick]

You can ignore the controller (the temperature inhibit switch). Leave it alone. The relay is just a relay. It doesn't need an additional ground. Apply 12V to the small pole, and it should send power to the plugs, as well as light the GP lamp.

[BobQ]

Thank you.