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Originally posted by grcamna2 View PostIan,did you buy the bike without the right battery cables on it ?
Only thing I've changed is that the yellow wire was put in place of the old black one because wire being corrodedLast edited by timebombprod; 05-02-2021, 11:25 PM.Ian
1982 GS650GLZ
1982 XS650
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Update on the coilpacks. Not trying to do a bunch at once but I figured tracing voltage for ground I might as well check what voltage is going to the coils.
So testing just the coil connections I get 6.5v
Negaitve battery post to positive coil connection about 7.8v
Positive battery post to negative coil connection about 10.5v
Keep in mind these coilpacks and ignition are new....maybe not anymore.Ian
1982 GS650GLZ
1982 XS650
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Originally posted by timebombprod View PostUpdate on the coilpacks. Not trying to do a bunch at once but I figured tracing voltage for ground I might as well check what voltage is going to the coils.
So testing just the coil connections I get 6.5v
Negaitve battery post to positive coil connection about 7.8v
Positive battery post to negative coil connection about 10.5v
Keep in mind these coilpacks and ignition are new....maybe not anymore.
With KOEO ( that’s Key On Engine Off), meter black lead on the battery negative post, and red meter lead on the orange/white at the coil, read the meter. That’s the voltage available at the coil. I suspect that should be the 10.5 volts you posted above.
Subtract that 10.5v from your battery voltage, say it’s 12.5v, and you are dropping 2 volts just to get power to your coils.
Or to measure the voltage drop directly, with KOEO, put the red meter lead on the Positive battery post, put the black meter lead on the O/W wire at the coil, and read the voltage drop on that portion of the ignition circuit.
I suspect you also have a similar voltage drop on the ground side of the coil circuit. Between the voltage drop on the power side plus the voltage drop on the ground side of the circuit, I suspect you coils are only getting 70-80% of the available voltage.Jim, in Central New York State.
1980 GS750E (bought used June,1983)
1968 CB350 Super Sport (bought new Oct,1968)
1962 CA77 305 Dream (bought used Feb,1963)
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Originally posted by pdqford View PostIt’s hard for me to see just where you have your meter leads connected.
With KOEO ( that’s Key On Engine Off), meter black lead on the battery negative post, and red meter lead on the orange/white, read the meter. That’s the voltage available at the coil. I suspect that should be the 10.5 volts you posted above.
Subtract that 10.5v from your battery voltage, say it’s 12.5v, and you are dropping 2 volts just to get power to your coils.
Or to measure the voltage drop directly, with KOEO, put the red meter lead on the Positive battery post, put the black meter lead on the O/W wire at the coil, and read the voltage drop on that portion of the ignition circuit.
I suspect you also have a similar voltage drop on the ground side of the coil circuit. Between the voltage drop on the power side plus the voltage drop on the ground side of the circuit, I suspect you coils are only getting 70-80% of the available voltage.
For negative battery post to positive coil connection, negative is on the battery itself and positive is on the coil where positive coil connection is, and vice versa
All is key on ignition offIan
1982 GS650GLZ
1982 XS650
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Originally posted by pdqford View Post
Or to measure the voltage drop directly, with KOEO, put the red meter lead on the Positive battery post, put the black meter lead on the O/W wire at the coil, and read the voltage drop on that portion of the ignition circuit.
I suspect you also have a similar voltage drop on the ground side of the coil circuit. Between the voltage drop on the power side plus the voltage drop on the ground side of the circuit, I suspect you coils are only getting 70-80% of the available voltage.
When doing this test,I got a whopping 4 volts. What do I do from there.
I've been checking other things for its voltage and everything else seems to be fineIan
1982 GS650GLZ
1982 XS650
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Originally posted by timebombprod View PostWhen doing this test,I got a whopping 4 volts. What do I do from there.
Example:
From Battery positive post to input to main fuse.
From main fuse input to main fuse output.
Main fuse output to ignition switch input.
Ignition switch input to ignition fuse input.
Ignition fuse input to ignition fuse output.
Ignition fuse output to kill switch input.
And on and on.
You May find all of the voltage being dropped at one point or you may find a little here and a little there.
Clean up connections and switches, resolder poor crimps, etc., where you find the biggest drops first.Jim, in Central New York State.
1980 GS750E (bought used June,1983)
1968 CB350 Super Sport (bought new Oct,1968)
1962 CA77 305 Dream (bought used Feb,1963)
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I'm losing almost 3 volts from positive battery post to ignition fuse, aswell as the turn signal and head fuse. I noticed that these fuses can only be tested with the key on. Noticed that the power loss on the fuse input went down a volt when i took the fuse out, I'll be getting a new one to see if theres a difference
Losing .1v from positive battery post to fusebox, and .4v from positive post to main fuse
Losing .39v from Ignition fuse to ignition wire plugLast edited by timebombprod; 05-04-2021, 05:15 PM.Ian
1982 GS650GLZ
1982 XS650
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