• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

12 volts at coils

  • Thread starter Thread starter terrylee
  • Start date Start date
T

terrylee

Guest
I did the coil relay mod. some time back on the 450 winter project. And today since I can't seem to get bike to run right I checked the volts to the coils. Well I wasn't getting but a couple of volts from one coil and about 11.8 from the other. Checked it on relay, and what was on coil side also, got the same readings no matter where I took the readings. So replaced relay with new one and changed all connectors on relay and changed ones on coils. Seemed to solve the low volt readings. But bike seemed to run no better, so checked volts at spark plug ends(with bike not running and key on) and getting 11.5 on cylinder two, but only about 1.8 volts on #1. So unplugged white wire from coil to ignitor and got 11.8 volts at end of plug wire while white wire is unplugged. Reconnect white wire and volts drop to 1.8 again. Does this mean I have a ignitor problem or just a wire problem some where? (I plan on taking harness apart and following white wire, as soon as I have time.) :confused: terrylee
 
terrylee said:
I did the coil relay mod. some time back on the 450 winter project. And today since I can't seem to get bike to run right I checked the volts to the coils. Well I wasn't getting but a couple of volts from one coil and about 11.8 from the other. Checked it on relay, and what was on coil side also, got the same readings no matter where I took the readings. So replaced relay with new one and changed all connectors on relay and changed ones on coils. Seemed to solve the low volt readings. But bike seemed to run no better, so checked volts at spark plug ends(with bike not running and key on) and getting 11.5 on cylinder two, but only about 1.8 volts on #1. So unplugged white wire from coil to ignitor and got 11.8 volts at end of plug wire while white wire is unplugged. Reconnect white wire and volts drop to 1.8 again. Does this mean I have a ignitor problem or just a wire problem some where? (I plan on taking harness apart and following white wire, as soon as I have time.) :confused: terrylee
Click to expand...
The voltage is measured at the coil(s) on the orange/white wire(s). your trying to measure the voltage on the igniter (ground) side of the coils . the 1.8 volts you measured is when the igniter has grounded the coil in preparation for the firing of the coil. when the igniter opens (disconnects) the ground circuit from the coil, is when the the magnetic field collapses and induces current into the secondary (high voltage) side of the coil and the plugs "spark".

the igniter alternates this process from one coil to the other coil. when one coil is grounded, the other is not. that is the reason you are measuring 11.8 volts on the ungrounded coil, while on the grounded coil you are measuring close to 0 volts (1.8).

there is a procedure for checking the ignition system in the shop manual and, IIRC it's also on basscliff's site.
 
Thanks Rusty, I should have known that, I had read about it before, but sorted of freaked when I got those readings. I will do the test and see what I get. terrylee
 
You must log in or register to reply here.

Similar threads

J
GS750 - Points Problem
Replies
1
Views
82
JT-NZ
J
peteGSX
1982 GS450 - No Spark
Replies
11
Views
130
peteGSX
peteGSX
E
1982 GS650E More Ignition Issues & Gremlins
Replies
3
Views
116
EmmCee
E
Adi00
GS750 Charging system….I hate them!
Replies
5
Views
135
Nessism
Nessism
C
Power to coils
Replies
8
Views
191
Christopher
C
Back
Top