MSD ignition wiring help needed

[relkceb]

Can anyone help me by telling me where the diffrent wires from the MSD6AL and tach adapter 8910eis plug into my original wiring. I have been having troubles with this and MSD techs aren't really any help either because they only have wiring diagrams for the older turbos.

[bit]

Hi Relkcab,
What year? Did you check this Pelican Article? Lotsa info on this, just search.

http://www.pelicanparts.com/techarticles/mult_MSD_install/mult_MSD_install.htm

[snip]

NOTE: Disconnect battery ground while installing MSD unit. The heavy red wire should be connected directly to your positive battery terminal connector. I found the best place to connect the heavy black ground wire was the chassis lug! located behind the battery, where the battery ground strap connects. A disconnect on the ground lug of the battery is handy to have. In both cases, dress the wires neatly and cut them to length, replacing the lugs with new crimp-on terminals.

Other Connections:

The wiring of the MSD unit is well illustrated in the excellent manual which accompanies the unit, but for the record:

Red wire: Red wire formerly on + side of coil Also connect to one side of 8910 tach adapter (use splicer in kit to attach directly to red wire)

Black wire: - side of coil

Orange wire: + side of coil

White wire: (green) wire from points, wire from tach (black/purple). (You can fashion a one to two wire adapter or use a splice co! nnector here) Also connect other side of 8910 tach adapter (use splicer in kit to attach directly to white wire)

When attaching these wires, I recommend sticking with the connectors already in place and using jumpers to make the female-to-female connections. In the event of an unlikely failure of the MSD unit, it is a trivial matter to drop back to standard spark but reconnecting the red coil wire (+), green point wire (-), and black/purple tach wire (-) back onto the coil and drive off.

[snip]

Here's an old drwaing of my set up.



Cheers,
.Steven
1980 911SC

[relkceb]

Thanks, Steven I forgot to post that my car is a 87 930. this looks like it should work for me but I wanted to make sure.

[RoninLB]

I use the main starter lug to tap 12v power.