While driving my car died and has no spark,my car has the stock distributor with a Mallory Unilite module in place of the points installed by the previous owner about 6 years ago with no problems until tonight
I checked for voltage at the pos. side of coil with key on and had 5 volts
Cranked engine and had 9.6 volts at pos. side
Neg. side shows about 2 volts steady while cranking
Need help isolating the problem from this point
Thanks for any input

The unilite must be used with a compatable coil. I don't think a stock coil has the correct resistance for the unilite. It also can be damaged by reverse polarity or surges, they sell an add on module to protect the unit.
Remove the cap and crank the engine to make sure the distributor is turning.

David,
Thanks for the reply and the coil is a mallory coil not stock
The distributor is turning
The voltage values i have listed above i do not know if they are normal and the car has been running great for 6-7 years with this setup using stock wiring

I know this is going to sound funny but I had the same prblem.I looked for this problem for a long time. I changed dist. wires, coil still no spark until I changed spark plugs.I know that sounds funny but it hapened to me,the car ran great till I got it home then it wouldnt start again. kenny

the voltage on the negative side of the coil should pulse (hundreds of volts) once for every time a spark fires
if it isnt it is your pickup in the dist or the wiring to it

also try measuring the resistance of the coil with the wires disconected

the voltmeter stays steady at 2 volts on neg while cranking
also which leads on coil do i test for the resistance test

check the coil manufacturer for specs on resistances but normaly you check for primary resistance from + to - and
for a short from the - to the output (spark plug wire spot)

most voltmeters will not register quickly enough (mine doesnt even move) to see the change in voltage you would see on the neg side of the coil

if you want to try and test the coil take the negative wire off the coil and attatch a temp jumper that you will tap to a ground and see if you get any spark form the coil wire to ground (take the wire off the dist. cap and hold near ground just like your checking for a spark)
turn the key on and verify + voltage at the coil and tap the negative jumper to ground and you should see a spark at the high voltage wire (it hurts a lot ive been hit too many times)

oh and just to cover more bases check the resistance of your plug wires are ok and not open, dont forget the coil wire