external resistor

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   Hi there,

   My external ballast resistor failed on my '74 SN.  I was able to find one locally, it is 1.6ohms of resistance.  Is this correct?  I know that discount inboard marine sells one for this boat, but I'm not sure what the resistance is on that one.  The boat seems to run just fine now, so i think the spark is plenty hot enough.  I am getting a reading of about 4-5 volts at my coil, is that normal???

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
74SkiNautique Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: July-29-2008 Location: Lynchburg, VA Status: Offline Points: 228	Post Options Post Reply Quote 74SkiNautique Report Post Thanks(0) Quote Reply Topic: external resistor Posted: June-13-2012 at 2:56pm
	Hi there, My external ballast resistor failed on my '74 SN. I was able to find one locally, it is 1.6ohms of resistance. Is this correct? I know that discount inboard marine sells one for this boat, but I'm not sure what the resistance is on that one. The boat seems to run just fine now, so i think the spark is plenty hot enough. I am getting a reading of about 4-5 volts at my coil, is that normal???
	74SkiNautique

8122pbrainard Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040	Post Options Post Reply Quote 8122pbrainard Report Post Thanks(0) Quote Reply Posted: June-13-2012 at 7:54pm
	Chris, The 4 to 5 seems pretty low. Nominally (depends on input volts IE: if the alternator is putting out charging the battery or not) it's around 9 volts to the coil. Ohms law is consistent so, if you want to take the 12-13 volts down to the 9, the ohm value is the same. Get one from Skidim or your local auto supply. BTW, you didn't by chance get that 1.6 at Autozone did you?? Where did you read the 4 to 5 from? If you went from the + and - side of the coil, that's wrong. Check between the + and the - block. The resistance of the primary winding in the coil can screw up the reading. Some meters will read it. Hey, at least the boat is running!!
	54 Atom 77 Tique 64 X55 Dunphy Keep it original, Pete <

74SkiNautique Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: July-29-2008 Location: Lynchburg, VA Status: Offline Points: 228	Post Options Post Reply Quote 74SkiNautique Report Post Thanks(0) Quote Reply Posted: June-14-2012 at 3:27am
	I put my 12v meter on the Positive lead of my coil. And hooked my ground up to the block, with the engine running i get about 4-5 volts. I thought its supposed to be around 9. The coil feels pretty warm, but im not sure how that is supposed to feel. I got the resistor at a Fisher auto/marine shop by my lake. its the only one he had, and it was a 1.6ohm resistor. My coil checked out okay, both on the primary and seconday tests.
	74SkiNautique

external resistor

About CCF

Donate

Partners

Contact