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53 Posts
Hey guys,
Like most rodders I run a MSD billet distributor, superconductor wires, and a blaster 2 coil on my 78 firebird with a small block chevy. When I installed it the car would run on for exactly twenty seconds after it was shut off. I read the instructions and found that when used with a delcotron alternator a diode (supplied) must be installed in the wire to soak up extra energy once the ignition has been cut. Problem solved...I thought.
All was good for a few months to a year but all of a sudden one day it started running on when the ignition had already been cut. The engine runs as if it were still in the on position (no missing or anything) but stays on for exactly 20 seconds every time.
Sometimes, however, the engine dies promptly when the key is turned off, like it should. Other times it does the 20 second run on. I was wondering if the diode can possibly go bad or if it is a bad connection. I soldered it into the wire and covered it with shrink tube to make sure it was perfectly snug.
As stated before, it worked fine for a long time but stopped working all of a sudden, so i figured i connected it right initially. Are diodes one way as some suggest? If it did go bad, how are they rated (ohms) and what would be the right size for a replacement. Is it easier to just reconnect the wire to the alternator without the diode and run a switch? Without the diode though it still might run on i assume.
Thanks all.
Like most rodders I run a MSD billet distributor, superconductor wires, and a blaster 2 coil on my 78 firebird with a small block chevy. When I installed it the car would run on for exactly twenty seconds after it was shut off. I read the instructions and found that when used with a delcotron alternator a diode (supplied) must be installed in the wire to soak up extra energy once the ignition has been cut. Problem solved...I thought.
All was good for a few months to a year but all of a sudden one day it started running on when the ignition had already been cut. The engine runs as if it were still in the on position (no missing or anything) but stays on for exactly 20 seconds every time.
Sometimes, however, the engine dies promptly when the key is turned off, like it should. Other times it does the 20 second run on. I was wondering if the diode can possibly go bad or if it is a bad connection. I soldered it into the wire and covered it with shrink tube to make sure it was perfectly snug.
As stated before, it worked fine for a long time but stopped working all of a sudden, so i figured i connected it right initially. Are diodes one way as some suggest? If it did go bad, how are they rated (ohms) and what would be the right size for a replacement. Is it easier to just reconnect the wire to the alternator without the diode and run a switch? Without the diode though it still might run on i assume.
Thanks all.
imp: 
