Re: 1978 Merc v6 ignition trouble
There are a number of reasons why it may not have spark.<br /><br />First check battery connections..see if they are tight and that you have atleast 12.6 volts at the battery.<br /><br /> Ign switch..switchboxes..stator..trigger are the likely candidates.<br /><br />If you d/c the yellow and black wire at the switchboxes, you can take the ign switch out of the equation.<br /><br />It is rare for the trigger to take out all 6 cyls. <---this can be more or less ruled out.<br /><br />That leaves us with 2 alternatives. Stator or Switchboxes.<br /><br />Without a DVA tester, you will be guessing at the problem.<br /><br />

<br /><br />Wish I could be of more help.<br /><br />TMD