jacob80 Posted August 6, 2010 Share Posted August 6, 2010 Hey guys, Well I've been running out L28ET 240z with our 280zx 60 amp alternator for about a year and a half now. I've just rewired Megasquirt and for some reason, I was looking down at the plug (http://www.thezstore.com/page/TZS/PROD/12-4067) and noticed that it had a melted hole in it from the diode overheating! This may or may not be relaed, but this is the issue. First off, an overheating diode had clearly failed, I get that. For the tach to work, I connected the two wires that we on opposite side of the ballast resistor together and put the B/W wire on the positive lead. This was all fine and dandy until: A) I realized the lead that goes to the + side of my coil is a 12v switched source, thus giving power to my fuel pump at all times (NOT good)the key was on and causing a no-spark condition. After I turn off the key, the car would stay running with this lead on the + post of the coil. Occasionally, the car would turn off by itself by blowing the fuel pump fuse on the relay board (I've had this fuse problem before whenever I would kill the car by fault of my own). Are both of these issues potentially related to the diode failure? IIRC, the diode is indeed to prevent the car from continuing to run after the key has been switched off. Thanks guys! This is the plug in the link: Quote Link to comment Share on other sites More sharing options...
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