|
The way it's wired is that a wire comes off of the ign switch and runs to the fuse block. At that point it connects to another wire that carries the 12v to the coil + terminal. So the current does NOT pass through a fuse. Then another wire is connected to the - term on the coil and runs back into the cabin and through the tach, then back into the engine bay where it connects to the condenser/points. Nowhere along the path do I measure continuity between wire and the chassis so I'm confident nothing is grounding anywhere. Nor is there any measurable resistance in the wire as it passes through the tach. I get 12v all the way around the loop including in and out of the coil. I see no measurable degradation in voltage as the spark deteriorates. With only about 1 ohm resistance across the primary coil I guess it has little effect on the current flow. The car does NOT have a separate ballast resister nor do I think it ever did. None shows on the wiring diagram either.
I received a new blue made in Brazil Bosch coil last night from Parts Geek. I have not had a chance to try it but on the bench it reads about 3.5 ohms primary and 10k ohms secondary. I think I read somewhere that coil is considered to have a ballast built in. Got my fingers crossed.
--
Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (fixed the brake fluid leak - now on to the ignition)
|
