Clarification on coil test with ohmmeter
Posted: Sun Dec 17, 2017 6:09 pm
Gentlemen,
New to the Spree world, new to the board. I recently acquired a really clean white 84 NQ50 Spree in non running form, and I have a lot of needed parts ordered (the carb had been "tuned" by a relatively clueless person resulting in stripped mounting stud holes and the needle broken off the bystarter, and silicone on the fuel bowl to supplement the flattened o ring gasket among other things. So it goes. While I wait for parts began checking out the electrical system and was pleased to see no butchery there. Horn works, starter works, front turn signals come on but don't flash (thinking it's a ground problem with the rear ones as they appear to ground through the rack), fuel gauge and low oil light are operational (I checked the fuel sender out of the tank first with an ohmmeter to verify that it should work). It even has the original Owners Manual and a registration from Niles, Michigan from 1985 tucked under the seat.
So since all was looking so good, I checked the spark and had none. So I consulted the service manual I downloaded from this most wonderful and informational site and started following the checklist on P. 14-9 and started with the coil. So after all that explanation, here's my question: following the procedure outlined in the service manual on P. 14-8 I came up with this: reading resistance across the green and black spades on the coil I get .4 ohms which is very close to the prescribed .1-.3. But when I check across either the black or green spade and the end of the spark plug wire with the boot removed, I get infinity.
So I'm thinking I have a bad coil, but I'm hoping some of the knowledgeable folk here will drop in and either confirm my diagnosis or tell me to move on down the checklist.
Love the site. Started reading all the tech stuff long before I went hunting for a Spree to mess with. Thanks to all and I hope someone has a little time to read my diatribe!
New to the Spree world, new to the board. I recently acquired a really clean white 84 NQ50 Spree in non running form, and I have a lot of needed parts ordered (the carb had been "tuned" by a relatively clueless person resulting in stripped mounting stud holes and the needle broken off the bystarter, and silicone on the fuel bowl to supplement the flattened o ring gasket among other things. So it goes. While I wait for parts began checking out the electrical system and was pleased to see no butchery there. Horn works, starter works, front turn signals come on but don't flash (thinking it's a ground problem with the rear ones as they appear to ground through the rack), fuel gauge and low oil light are operational (I checked the fuel sender out of the tank first with an ohmmeter to verify that it should work). It even has the original Owners Manual and a registration from Niles, Michigan from 1985 tucked under the seat.
So since all was looking so good, I checked the spark and had none. So I consulted the service manual I downloaded from this most wonderful and informational site and started following the checklist on P. 14-9 and started with the coil. So after all that explanation, here's my question: following the procedure outlined in the service manual on P. 14-8 I came up with this: reading resistance across the green and black spades on the coil I get .4 ohms which is very close to the prescribed .1-.3. But when I check across either the black or green spade and the end of the spark plug wire with the boot removed, I get infinity.
So I'm thinking I have a bad coil, but I'm hoping some of the knowledgeable folk here will drop in and either confirm my diagnosis or tell me to move on down the checklist.
Love the site. Started reading all the tech stuff long before I went hunting for a Spree to mess with. Thanks to all and I hope someone has a little time to read my diatribe!