It is technical, how to use a (V) volt meter to measure I (current). The resistance of the EHA is probably so high that you have no resolution on the voltage change. It could also be controlled voltage so the current changes but the voltage is held constant.

You need a 1 or 10 ohm series resistor I wouldn't encourage you to do it. Are you saying you meter doesn't have an (DCA) direct current amps scale or (DCMA) milliamps:less than one amp? It might just be labeled without the DC.

If so ~20 - 30$ will buy a good enough multimeter at Homedepot or Radio Shack. Try asking the sales guy for a meter that will measure just a few miliamps. They will at least be able to show you where on the meter to look for the current scales.

Covered you on the other measage too. You might want to start a new post to bet braoder help on how to measure, adjust and balance the the EHA and mix.

The slow rise means the two are not centered on their control range. what do you mean by even engine flow? Smooth rather than rough or surging of surching? It is helpful to say where the idle ended, high means you are rich and low means you are lean.

Getting to the balance takes some imagination and perception. When the mix is in the 60's the EHA needs to go to where it pulls the mix to 50%. ie., Starting at 60%, ( i think that is lean so EHA is set too rich) go anothe 1/8 cw. Now which way does the % go? If higher like 70%: wrong way. Go back 1/4 ccw (now 1/8 ccw from where you started.) % should go below 60% and you are going the right way.

When you get close, the voltage and rpm will not ramp and peg or ramp and quickly start the ramp again. It will hunt, jump around, in the same voltage area, at 2000 the voltage should be the middle of idle movement and not off outside the idle range. The only way you can get ther is to get the EHA current to zero +- just a little. That means centered at zero. And, The % will allow you to adjust it to the same % at both idle and 2000.

Stay in there.