I can give you the info from my haynes manual for the cds. Say's to check for voltage at terminal 4 at the coil ( the ht terminal). Remove the coil to distributor ht lead at the distributor and support it 10 mm from a ground on crankcase.Do not ground out or hold too far from ground or damage to coil will occur inside the coil.If no spark occurs then remove the ignition coil connections connections and connect an ohm meter between the coil terminals 1 and 15 ( primary ) ; there should be a resistance of 0.4 to 0.6 ohms. Repeat the check between terminals 1 and 4; there should be a resistance of 650 to 790 ohms.To check the current draw by the cds unit, connect a ammeter into the the No. 15 wire from the ignition switch, then disconnect wire no. 1 at the distributor.With the ignition on, There should be a current of 1.0 to 1.9 amps. If outside this range a replacement cds unit should be obtained.
Thats all the says about the cds unit.so I hope this will help you out. Check you rev limiter in the distributor for a short also. could be the culprit.let us know what you find. good luck
