You have got to be kidding? So I have been having electrical issues with my 97 150EFI Magnum since early spring. I have read, replaced, reread, and read some more..... My problem has always been intermitted spark, or sometimes no spark at all. I have replaced the switch boxes, and replaced or exstensivley cleaned every wire and ground on the entire engine. So heres the new issue. Once my engine has spark, it runs like brand new. All day, continually starting and stoping the engine for as much as an hour at a time. I bring it home. The next weekend I always crank it up befor i leave the house with ears on it, just to make sure everythingis working properly, and it never has spark on one side of the engine. I have to remove the switch boxes, loosen all the wires, one at a time, and put it back together befor it gets spark. Now i know what your probably thinking, bad connection. Yes, but where? I have never been able to methodically take one wire off at a time and replece it and get spark. Now Saturday Im working on getting it spark and i realized it has nothing to do with any wire, it the switch boxes themself. When i loosen the two screws that attach the boxes to the engine there is spark and when i tighten them there is no spark. I am not pinching any wires, the boxes have a ground wire from each box to the other, and another wire to the block. The have SS machine screws going through them with a spacer between each other and nothing ealse. What is going on? I just dont get it. Once i initally get spark and the engine cranks, i can tighten the screws and never have a minutes trouble out of the motor all day. Its diving me crazy. Sorry for the long disertation, I just didnt want anything to get lost in translation. Thanks for any input in advance. Verne
