Problems After Replacing Alternator Form Stock To 100 Amp

mhjo · Jun 15, 2012

I bought a 100 amp Tuff Stuff alterternator. We connected it as instructions suggested.

Car started and ran nice on idle. When I was driving the car suddenly stopped serveral times, as engine just died. It started nomally after stop, but engine died sever times + hesitatded at times too.

I have a MSD blaster coil, Mallory distributor with extra "circuit guard".

We pulled and wiggled all leads in order to provoke the situation, but it only occurs while driving.

What is going on?

woodsnake · Jun 16, 2012

Try a wiggle test with the key in the ignition switch. If the key is sloppy, that sounds more like your problem to me than anything to do with the new alternator.

mhjo · Jun 16, 2012

Thanks, but as mentioned, this problem started immidiatly after alternator change. Never had similar problem before yesterday.

woodsnake · Jun 16, 2012

What is different though, when the car is moving, VS sitting while you wiggle the wiring around? Maybe the motor move a bit in it's mounts, or there may be some more heat somewhere on a wire.
I understand what you are saying about the immediate change, but could it be coincidental? Can't hurt to check the switch real quick anyway..

mhjo · Jun 16, 2012

Thanks. I agree tah "no stone unturned", but I am starting to suspect this unit http://www.summitracing.com/parts/MAA-29371/
Maybe the new strong alternator is fooling it to breaqk the circuit?

rbohm · Jun 16, 2012

what voltage output are you getting with the engine running? at what rpm does the engine cut out when driving? does it cut out when driving normally, or just when you romp on the pedal?

mhjo · Jun 16, 2012

Well, wiggling the ignition/key does not provoke the problem. Just wonder if the coil has gone bad?

The car just stops all of a sudden, and sometimes it hesitates, like coughing.

rbohm · Jun 17, 2012

well and ignition coil is cheap and easy to replace, start there and see what happens.

mhjo · Jun 19, 2012

Thanks - it was the coil!

woodsnake · Jun 20, 2012

Thanks for posting the fix!

Problems After Replacing Alternator Form Stock To 100 Amp

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