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Pick-up coil reads too high

1K views 8 replies 3 participants last post by  jonathanrsr 
#1 ·
The Haynes manual lists the pick-up coil resistance at 530 ohms (+ or - 10%), so maximum value for a working coil would be 583 ohms.
Picked up a replacement coil and took it to a friend (electrical technician - tv studio)to check the resistance with his analog multimeter, and he got the correct values. I then tested it with my digital multimeter, and got the same reading, so presumably both instruments were in synch. Went home, put my meter on the pick-up coil, and got a reading in the 700's. At the risk of asking what may be an obvious question, a reading this much higher than 583 would indicate a bad coil, correct? Thank you in advance.
 
#2 · (Edited)
Find a resistor with a known value of approx. 600 ohms, test it with your meter.
This will tell you what's going on with the meter.
Put a fresh battery in your meter.
They can get funky if the batt's low.
 
#3 ·
Yes, 700+ ohms does sound suspect. If there's firing/ignition problems & I had that reading I would replace it.
 
#5 ·
IrlMike, the reading was over 700, so looks like a replacement will be next.

Jimbo, the replacement part was off the bike. I tested the original on the bike, both cold and hot (used a hair dryer on high for 7 minutes), and got the same readings each time.

Thank you both.
 
#6 ·
"I tested the original on the bike, both cold and hot (used a hair dryer on high for 7 minutes), and got the same readings each time."

What reading did you get when you read this coil?
 
#8 ·
Gotcha.Just trying to get this sorted out with ya.
I still think it's worth rechecking the "replacement" with a known accurate meter.
Of course if this is a used replacement, the reason it's "used" may be obvious.
Just tryin' to save ya a few bucks.
 
#9 ·
Jimbo,

Many thanks for your input. I greatly appreciate ANY suggestions to save some $'s!
As far as checking the replacement P-U coil with a known accurate meter, I have a lot of confidence in my buddy's analog. As a TV tech, his stuff has to be up to speed. That's why I took my multimeter over to him to compare the readings.

Looks like I'll be removing the old P-U coil, and replacing with the one we both tested.

Thanks again for your interest and suggestions. It's guys like you that make this forum such an incredible resource.
 
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