no spark on 1979 merc 140hp

[jimbo8489]

hey guys, I was wonderin if anyone had any ideas for me. I have a '79 Inline 6 140 horse with no spark. i took it ot the local mercury mechanic and he told me there was a switch box that was bad. At that time only three of the 6 cylinders had spark. after replacing the switch box there is now no spark on any cylinder and the guy said that the readings on the stator are all wrong. I checked it out myself and found the resistances all wrong also. So i put a new stator in myself, but still no spark. If anyone has some advice I would really appreciate it. Thanks, Jim

 

[Laddies]

Re: no spark on 1979 merc 140hp

Have you disconnected the blk/yel wire from both boxes, have you disconnected the 2 yel wire from the rectifier, have you disconnected the bias wire between the switch boxs( a bad bias in one box can destroy a new box with the exception of CDI boxes)

 

[jimbo8489]

Re: no spark on 1979 merc 140hp

where does the blk/yel wire come from, the trigger or stator? why would disconnecting the rectifier do anything? and is the bias wire the blk/white wire that goes between the two switch boxes?

 

[Chris1956]

Re: no spark on 1979 merc 140hp

Jimbo, Here is the ADI Troubleshooting link. You should be able to track it down...
http://www.boatpartstore.com/page26.asp

 

[jimbo8489]

Re: no spark on 1979 merc 140hp

thanks chris but just one more question. on the link you sent me to at the top of the page it says disconnect the blk/yel wires from the PACK. do they mean the coil packs er wat?