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Discussion Starter #1
This is a long &I made a post in engine area
a couple of days ago.When I bought this car
[68 chev]a year ago Oct I noticed a miss and
cutting out problem starting at 2000 rpms.My
gut feeling was ign problem.Had a msd 6al box
timing control& a two step.So I bought a new
msd ready to run dist and then called msd
which they walked me thru all the hook ups.I
went thru it twice & cleaned up everything.
That seemed to cure the problem.Took car to
the track & it ran great.Next time out it
started missing & cutting out at high rpms.
Everybody swore it was fuel but I didn't buy
that it just didn't fit as far as I was concerned.This went on all year long.New big
high out put alt,new heavy ing wire,checked
all wires again &all grounds.Nothing helped.
Since all this I just installed a brand new
zz502 & after break-in I noticed the same
cutting out and missing at 2000 rpms & up.I
went thru all wires again,called msd to re-
check all hook ups& all was correct.I went
and got a HEI dist from a buddy &put it in &
bingo it ran great.Bad dist!!WRONG] Took it
back & got another new msd dist & after I got
it & running it started missing & cutting out
just like before.Had another msd box &tried
that nothing changed.So I took my ing wire
off the fuse box & ran it straight off the
batt side of the alt & bingo it ran great.I
put back in the HEI and hooked my ing wire to
the fuse box the car ran great.Enough volts
for a HEI but not enough volts for a MSD?Here
is where I need someone to explain to me how
the charging system works.Let me say this 1st
I changed to a internal type alt& this is
where Im somewhat confused?I have had five
different guys tell me mine is hooked up right.Red wire off stud on back of alt to #2
which is a jumper wire.What I don't understand is how is volts getting to the fuse box this way?Also,a shop hooked up the
kill switch for me by running a heavy wire
from the batt of the alt to the batt side of the kill switch.The old voltage regulator/all
wires unhooked. Help.How is volts getting to
the fuse box this way?

------------------
<A HREF="http://chevelles.com/showroom/driver10.jpg" TARGET=_blank>My 68 Chevelle @ The Super Chevy Sept2001
E.T 10.886 @116.59 60ft 1.5 1/8 6.838</A>

More 68 pics

70ss sold to team member

[This message has been edited by driver (edited 01-19-2002).]
 

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Couple of things in what you said.

"So I took my ing wire off the fuse box & ran it straight off the batt side of the alt & bingo it ran great.I put back in the HEI and hooked my ing wire to the fuse box the car ran great.Enough volts for a HEI but not enough volts for a MSD?"

It sounds, perhaps, that you don't have a good 12 volts to the ignition if this test works every time. 1, Have you changed out the resistor wire to a solid wire for the distributor? 2, What voltage do you get normally on the ignition wire (Car running)? Can you measure it to ground without your jumper? Can you measure it to ground with your jumper wire? See any difference?

"I have had five different guys tell me mine is hooked up right.Red wire off stud on back of alt to #2 which is a jumper wire.What I don't understand is how is volts getting to the fuse box this way?"

Originally there was a connection from the rear of the alternator (large terminal) that went to the horn relay. There it was tied with a wire that went to the bulkhead connector near the brake booster. You should see a large wire coming out of the harness at the horn relay. That's the one that goes to the fuse block.
 

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Discussion Starter #3
Yes I changed out the wire.I ran a wire off
the one that says IGN in the fuse box.Works
fine with a HEI and cuts out with a msd.One
thing I was wondering shouldn't there be a
wire on the # one post off the alt running
to the wires going into the car? Thats what
I meant about how is the fuse box getting
power?Right now it's like this.Red jumper on
the#2poll to the stud poll on the back of the
alt&another wire coming off the stud poll
going back to the batt which also kills the
kill switch when you push it in.Nothing has
been done to the old regulator except unhooking it.It's hard for me to get out
what Im trying to ask.Try this!! The red
wire going back to the batt coming off the alt is keeping the batt charged but is the
volts getting to the car?Shouldn't there be
another wire coming off the alt going into
the car to give volts.Or will this work as is? Explain?
Driver

------------------
<A HREF="http://chevelles.com/showroom/driver10.jpg" TARGET=_blank>My 68 Chevelle @ The Super Chevy Sept2001
E.T 10.886 @116.59 60ft 1.5 1/8 6.838</A>

More 68 pics

70ss sold to team member
 

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"Shouldn't there be another wire coming off the alt going into the car to give volts.Or will this work as is? Explain?"

Yes, either off the battery + terminal or off the large B+ lug on the back of the alternator. As I mentioned it originally went to the horn relay. Look for a large red or black lead, on the horn relay, that runs back up to the firewall. That's the line to the fuse box. What's connected to this wire at the horn relay? Should have another wire tied there. Where does that wire go to?
 
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