I got some questions on swapping out the Dual Point Distributor and replacing it w/ a Electronic Ignition Distributor on my 620. I got the electronic dizzy off a 79 620 at Pick & Pull along with the two wires that are connected from the matchbox to the coil. So I think I am pretty much all set for the swap except I need the ignition coil specified for EI. Is MSD Blaster 2 any good?

I am very familiar with the installation of the distributor. I only have questions on how exactly I should hook up the wires. I know that the two wires coming from the matchbox will be connected to the "+" & "-" terminal of the coil. However, I have questions on the following:
- How to eliminate the ballast resistor? Can I just simply disconnect the wires on it and connect both wires together bypassing the resistor?
- Which spark plug wires do I have to flip? Cylinder #1 and #3?
- Anything else that I have to do?

Thanks, Nelson

As far as I know, you can just remove the ballast resistor. I always do and have never had a problem, even with points.
I think the spades on the matchbox are marked with something like "B" & "G" (or is it "C"?), anyway, "B" goes to the + side of the coil and the other goes to the - side.
I don't know anything about swapping any other wires. What's that about?

If you are using the original coil, use the original ballast resistor. This coil is designed to work at a lower voltage than 12 volts.

Using a ballast resistor depends on the coil. Some high-energy coils use a lighter ballast, and some don't use a ballast at all.

I am planning to use MSD Blastor 2 coil after I hooked it up.

Quote:Two choices:

1. Yes, connect both wires together
2. add a relay and run power straight from battery through relay to coil. Relay runs off the original + to the ballast.

#2 is good for a 1200, as 1200s run ignition power straight through the ignition switch, and this will help prevent the extra amperage of the high-energy coil from eventually burning out the ignition switch.

What kind of relay should I use?

So if I plan on solution #2, I can just run the "+" terminal wire on the coil straight to the battery thru the relay?

Won't the battery constantly supply voltage and current even when the ignition switch is at off position?

Thanks,
Nelson

The 620 may already have an ignition relay. The 1200s do not.

The relay will be off when the ignition key is off. So connect relay switch line to the IGN + wire:

BAT+ --> |relay| --> Coil +
IGN+ --> relay switch wire


See ignition relay
See Datsun Roadster Ignition Enhancements, but instead of connecting the relay switch to the IGN starter wire, connect it to the IGN + wire. The newer vehicles are have a ballast starting -bypass relay (as shown here), it is built into the starter relay.
reference: Ballast vs. Non-Ballast Ignition Coils