After looking for what is making my car feel like it's not running on all 8,I took a volt reading at the ign. wire The one that goes to the coil +,and found that I'm not getting 12v as I think I should.It's reading around 8v.Could this be the problem why my car seems to be pulsating?(missing)
I had a short awhile back ,replaced the voltage reg,alt is fine but still had this problem.

Also,is there any way I could splice into the fuse box or somewere to get the 12v I need at the wire untill I can have it taken care of?...........
Please I need some help with this. Thanx in advance

What kind if ignition, points or HEI, or ??? If you have points, its not supposed to have 12 volts. Its supposed to be at 8 or 9. HEI's need 12 volts.

Sorry.it's an MSD 6AL with a MSD SS Blaster coil,and Msd pro billit dist.
The oridg. wire from the points is going to the + side of ther coil.I'm pretty sure thats' how MSD says to do it.Is that correct?

Thanx again

Go to the MSD site and download the instructions. Only wires going to the coil should be coming from the 6al. The distributor feeds the 6al the 6al feeds the coil. Make sure it's wired up correctly.

Sorry.it's an MSD 6AL with a MSD SS Blaster coil,and Msd pro billit dist.
The oridg. wire from the points is going to the + side of ther coil.I'm pretty sure thats' how MSD says to do it.Is that correct?

Thanx again
Nope. the only wires that go to the coil are from the MSD 6AL( orange and small black). With all MSD componets, the MSD 6AL should be wired as follows,
Big red wire to battery+
Big black to battery-
Green and Violet to Msd pro billit dist
Orange to coil+
Small black to coil-
Small red to switched IGN on ( you can use your factory original coil wire here)
White wire is not used

I just checked this out and everything is hooked up correctly.I have (2) wires that I have going to the SMALL RED wire from the MSD box.
They were both from the orid. coil.One is Black with a white cloth wrap ovrer it ,and the other is a orange,or brown wire,can't really tell kinda dirty, but I think it's orange. Thanx again

I have (2) wires that I have going to the SMALL RED wire from the MSD box.
They were both from the orid. coil.One is Black with a white cloth wrap ovrer it ,and the other is a orange,or brown wire,can't really tell kinda dirty, but I think it's orange. Thanx again
Black with white cloth is the resister wire and comes from the IGN switch, the other wire (yellow on a 70) comes from the starter "R" terminal. Both of these going to the small red is ok. Did you just change this or was it already wired that way? If it was already wired that way, to answer your original question,
and found that I'm not getting 12v as I think I should.It's reading around 8v.Could this be the problem why my car seems to be pulsating?(missing)
I had a short awhile back ,replaced the voltage reg,alt is fine but still had this problem.
The small red is only used to turn the MSD 6AL on. The box will turn on with as little as 5 volts applied to the small red wire. No power from this wire is used to fire the plugs, so the lower voltage here can not cause the missing problem. Lower voltage on the big red can cause missing. Check the voltage across the battery with the car running at a fast idle, should be 14-14.5 volts. Other things to check would be plugs, plug wires,cap, rotor and all connections.

I had these two wiresgoing to the coil from the install,checked the volts across the Batt,and it is 14.3 at a fast idle.I'm going to change out the plugs.I checked the resistance on the wires MSD 8.5 and there'r all within the 40-50 ohms per ft.I'll let you know how I make out with the plugs.If theres anything else you think I should check, please let me know.

Thanx much........

Well I changed my plugs.They all looked normal for my combo.Actualy alittle white so I went to a colder plug.But it still has that sound feeling like they're not all firing .What else can I check? Thanx

I had these two wiresgoing to the coil from the install, They went to the coil with the original points ignition, but they are on the small red going to the MSD 6AL now and the ONLY wires going to the coil are the orange and small black from the MSD 6AL?
Missing all the time, at all RPMs, just under a load, or ??? Check for vacuum leaks. Check initial and total advance. Vacuum advance working (if it applies) Float level and fuel pressure, Do a compression test. Did any of the plugs look different from the others? Might be running a little lean but todays gas doesn't color the plugs like gas from the good old days. Maybe you have a weak cylinder. Might want to post in the engine or performance forum too. Post your entire combo and all of the things you checked and the results.

The only wires going to the coil are the orange and the black from the MSD.
Missing I should say pulsating like not firing on all 8.AT 1500-2000rpm steady,is were I feel(hear) it also at 2500 cruisingRPM,but the tach does not fluctuate.That stays steady.

Timing is ok (18deg.36 in @2000) I don't think I have a vacume leak My vac is @ 12in nuetral and 8 in gear.(292 244@.50) cam (501 lift).
I checked comp. a while back. Don't remember the #'s but I do remember that it was consistant with my C/R (11:1) I want to say 190-200 but I do remember it checked out.

Plugs looked OK, I'm going to pull a couple of the new ones Iput in today and have a look at those.I even relashed the rockers thining that it might be that,but just the same.I did raise the floats just a tad till I smelt exhaust,still that same.

Would a coil thats bad dod this? And what would make the center contact for the coil on the dist. cap wear down to nothing only after 100 miles? This is what made me look further into this .................

Thanx again for the help

And what would make the center contact for the coil on the dist. cap wear down to nothing only after 100 miles? This is what made me look further into this .................

If its worn to nothing, then that most likely the reason for your miss. What does the rotor look like?
These are all new MSD parts right? How many miles on the engine? I only have guesses on that one. Maybe the distributor shaft end play is to great and its forcing the rotor into the cap. This could be caused by the distributor being bottomed out on the oil pump shaft. Shaved heads and manifold could cause this. You could look at the distributor base near the manifold, if its sitting above the manifold at all it could be your problem. You might want to post this question about your distributor cap contact at http://www.msdignition.com/ in their tech forums or email them.

I thought that it was part of the problem changed it and still does it.
I did post this over at MSD, and one of the techs asked me about ground straps to the fire wall.I replied that I thought that the straps were only to aid in radio interferance.Could be wrong ,but he aked if I had aluminum heads,and to run 10ga. wire from both the heads to the - side of the batt Not chassis.And that would take care of the problem. well the new cap has been on for 75 miles or so. No sign of wear ,but as I said it still has the same problem.
And the dist. is were it should be.Just checked that also.Also the rotor is in good shape. Thank you for the help ,I'm stumped.Like a dog chasing his tail