SparkandFire
We're drinking beer
I had Autolites on my brown truck with pushbutton control... They were all swollen and tough to get out. The previous owner put them in and only would glow for 5 seconds. then wait 5 seconds, then 5 seconds off heat... Still fried them.
The Beru/Motorcraft plugs are the only plugs to use. For all uses.
My '94 has the factory controller, only time I had trouble was when I bought it, had two bad plugs. Changed those two (about two years ago now) and the system has worked great ever since. The newer controller will protect the remaining plugs if one burns out. That is why it short-cycles when one or more plugs are bad. When one plug burns out, the remaining plugs will have a higher voltage applied to them. It's a chain reaction at that point. They will all eventually burn out, with or without a manual pushbutton, since you have no way of knowing if there is one burnt out. The 87-94 controllers are "smart" and they can detect the current draw and load resistance, and they go into a fail-safe mode when one or more plugs burns out.
The Beru/Motorcraft plugs are the only plugs to use. For all uses.
My '94 has the factory controller, only time I had trouble was when I bought it, had two bad plugs. Changed those two (about two years ago now) and the system has worked great ever since. The newer controller will protect the remaining plugs if one burns out. That is why it short-cycles when one or more plugs are bad. When one plug burns out, the remaining plugs will have a higher voltage applied to them. It's a chain reaction at that point. They will all eventually burn out, with or without a manual pushbutton, since you have no way of knowing if there is one burnt out. The 87-94 controllers are "smart" and they can detect the current draw and load resistance, and they go into a fail-safe mode when one or more plugs burns out.