Weak spark, part 2

Is your battery fully charged? I would expect to see at least 8-9V even while cranking.

Are you using the four terminal ballast? Those have two different resistances; one for the coil and one to drop the voltage to the control box, and one of them is a higher resistance than the other.

nate

I have 12.5 volts from the battery. The ballast has two terminals. The 7 volts on the + side of the coil is not while cranking. Chip

It should run OK on the 7 volts but try bypassing the ballast resistor and see if it helps.

If your system has a fusable link in it try bypassing it. It may have been made in China. Can you hold a plug lead while cranking (while grounded) and not get a jolt?

I'll give that a try.

Chip

"Alex Magdaleno" wrote:

No fusable link. I barely get a spark from the coil, none from the plugs.

Chip

"RPE" wrote:

I wouldn't use the dual ballest I would use the single. The dual was used for the lean burn cars. Send me a e-mail and I will send you the diagram for the single ballest system.

Actually the dual ballast was used on the early iterations of the control box; that wire is not used at all in the current production boxes. Apparently that ballast is built into the new boxes. I wired mine up for the dual ballast just in case I got stuck somewhere and had to use an old box. (it only took a minute or so to do the extra connection; that wire is still present in the new harnesses you get from MoPar)

nate