My 77 has the upgraded pencil glow plug and original relay. Recently the glow plug light wouldn't come on unless the starter is engaged. The relay isn't providing juice to the plugs when the key is in "glow" position but if you take the relay out then the car won't start. Any ideas on what is going on here? Also can't hear the relay trying to click in glowing position and I have tried unhooking the temp sensor so the relay would think it is very cold out, no dice.