Msd 6al Wiring Diagram Ford Mustang
Here is all the info I have collected over the years on this topic from many different forums.
Good Luck!
Part 1:
tach adapter
The black wire goes to a ground,white goes to the plug-in on the 6AL box.You don't use the purple one and the red wire goes to the red wire from the ignition switch.
Hope this helps. D.Thompson
Tach hook-up
The tach is hooked between the ignition and the positive side of the coil. The wire goes from the ignition to the tach, and from the tach to the coil. You will need a tach adapter to hook up an MSD.
Frank
How did you hook up your tach? The factory tach is hooked up to the ignition switch. The current goes from the switch to the tach and then to the positive side of the coil. You have to use the tach adapter with the MSD. I don't remember the complete part number, but it ends with 10. I will check one of my cars when I get to my shop later today
bosscougars
Needs a Job
Eliminator registrar
Posts: 2176
posted December 29, 2003 11:19 AM
Tach Adapter
They did give you the wrong information. The first one that I ever got was an 8920 and it screwed up my MSD. Got on the phone with a tech guy with MSD and he told me I needed the 8910 adapter. Tried it as instructed and it worked great. That was a few years ago and I have since installed MSD's on six of my cars with factory tachs including my Boss 9 that I just finished and they all work fine. The 8910 is a piece of cake to hook up compared to the 8920. The local O'Reilly auto parts store carries them. Check with your local parts store.
Frank
Do you have a fax available?If so, I will fax you a copy of the adapter info and the instructions. It specifies, the part #8910 is designed for non-current limiting(originally equipped with a ballest resistor) such as breaker points or optical triggered distributors.
The tech guy you talked to is WRONG, WRONG, WRONG.
If you'd like to call, my number is 918-655-3352. I have this application on six Ford factory tach cars and all work properly.
Frank
Dallas -----You need the 8910 tach adapter. It is easy to hook up. If you have any questions call me. I have MSD 6AL'S on six factory tach cars. Just put one on the Boss 9.
If you look down in the corner where the battery usually is you will see it looking at you[barely].
All of the answers you got so far are correct. You must remember electrical technology in 1970 is not the same as today. If you are using the MSD and the Ford tach in the dash a converter is required. If you are using the current technology tach it can be wired from the quick disconnect resessed terminal on the side of the MSD box.
Tach hook-up
With an aftermarket electric tach, the tach signal wire should be hooked to the tach output on the side of the MSD box. If it had been hooked ANYPLACE else or there had been a tach adapter used when it was not needed, it could have changed the voltage on the MSD tach output to approx. 12 volts and will not work. Check the voltage on the tach output and if it is more than 3-5 volts, it will have to be sent back to MSD to be repaired.
tach adapter
grabberblue,
I have that part right here and ordered it via Franks instructions(from earlier talks on this subject) from Summit. I have yet to install it but hope to get some time soon. MSD part # 8910. I'm still debating on where to hide it. Kind of a bigger adapter than I was expecting. About 4.5" x 2.5" x 2" thick and big mounting screws. Good luck!
____________
I have #8920 Tach Adapter. The wires out of the adapter go as follows; Black goes to a ground (make sure this is a good ground) White goes to the plug-in on the 6AL box, Purple is dead (don't use) Red to the red wire from the ignition switch. I hope this helps........Terry
bosscougars
Needs a Job
Eliminator registrar
Posts: 2176
posted October 23, 2002 11:02 AM
Correct tach adapter
GS was right. It has been discussed on the old board. The directions with the MSD for our cars is wrong. I had a long talk with a tech expert in El Paso and we agreed the correct adapter is part number-8910. I have them on five cars and they work great. It is a simple hook-up, two wires, and you don't have to go under the dash. If you have any questions, just ask. bowers@clnk.com That's what we're here for.
Source: http://1969stang.com/forum/index.php?%2Ftopic%2F40853-factory-tach-hookup-to-msd-6al%2F
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