Suzuki Club UK

i have no spark from the coil, but have power to both positive and negative on the coil (does this sound right). we've tried changing the coil and it changed nothing. we have changed all the ht leads for brand new ones and tried changing the dizzy cap and we still cannot get a spark out of any of the plugs. can any1 help at all as we a stumped. thank you.

Sounds like the distributor/generator is playing up. Yes you will get a reading of 12v to earth from the both the coil terminals when it's not running (but switched on) as the distributor is responsible for making this earth connection. When the earth is applied it charges the coil and when it is disconnected the coil discharges it's high voltage for the spark.
Here's a link to the workshop manual which shows how to test things (although the test for the generator is a bit crude) http://www.4x4.in.th/manual_sj413/chapter8.pdf" onclick="window.open(this.href);return false;.
Also a diagram of the wiring in case anything is broken (IE either wire to the distributor)

(yours is a 413 I believe)

I noticed that you didn't swap the rotor arm. Is the one fitted ok?

yeah the rotor arm we changed aswell, we have seen about 4 different diagrams now and they all seem to be different. i think we're going to go and mess about with it on wednesday but im starting to now think some wires may be on the wrong points. so would you say it doesnt sound like the coil then?. thanks for the help guys, its much appreciated.

Pic from my 413