Originally Posted by kstopp
It would appear from the diagram it's better to connect the module's heavy power feed up to the positive side of the starter solenoid and not just directly on the battery's terminal?
Unless you make your own high quality battery cables,
It's very hard to make a positive attachment at the battery that will live.
After market ring terminals will corrode VERY QUICKLY at the battery, so the wire is hard to keep attached!
By connecting at the end of the battery positive cable, you get to move your attachment point away from the corrosive effects of the battery, and still get all the current the module needs to operate correctly.
Do you mount your MSD module where the old ignition module sat on the driver's inner fenderwell? Or anywhere special to keep it away from the harmful elements?
I try and keep mine away from the worst of the heat and crud...
The back side of the grill shell is a pretty good place to mount the module in most cases...
And in '76 to '86 CJ's there is a vent blowing right on the back side of the module!
This isn't a MSD module, but this ignition box will show you where I'm talking about...
Personally, I mount mine under my dash above the gauge cluster.
As long as you don't run the ignition trigger wires in the same bundle with the other wires (that's why they are on opposite ends of the module... To separate them!) you can move the module to places like the glove box or behind your dash... Or someplace where it's not likely to get dunked underwater!
If you do a BUNCH of water, there is a sealed up version of the MSD 6 series module...
One is the 'Off Road' module, and another is the 'Marine' module, both are water sealed...
Originally Posted by Happy Joe
A good plan is to get additional (junkyard) plugs and to retain the stock ignition module/box (just unplug it and plug in the MSD), that way if your MSD box fails (I never had one fail but I have heard of failures), you can easily switch back to the original ignition and drive out.
That's why my diagram has the distributor adapter part number, and I give part numbers for the two most popular coil connectors.
With those two connectors, you have made the MSD a 'Stand Alone' ignition and if you just disconnect/tape over the factory coil connector, distributor coil connector, and module 2 wire connectors, you have the factory ignition as a back up...
If the MSD module fails, you simply connect the factory harness coil connector to the coil,
Plug in the factory distributor connector,
And plug in the factory Two Wire module connector,
And you have Trail Redundancy on your entire ignition!
A couple of connectors/plugs are pretty cheap when you start to think about getting a redundant ignition in the bargain!
Originally Posted by Soundman1
Hammer, does that diagram apply to the new 6AL2 also?
That diagram works for all the basic MSD 6 series modules. (6, 6A, 6AL, 6T, ect.)
Wiring colors will be correct for the Off Road module, but the connectors will be different!