Hi guys,

Currently i’m troubleshouting a Pymouth GTX from 1968, the car is running and driving smooth for 30 seconds. after that the engines runs so rough that it will shutdown itself.

The first thing I have tested was the battery and tried my second battery, booth were fine, then I noticed while running the engine, the battery I not charging at all.

Unplugged all the wires, cleaned small corrosion and checked all the fuses, that should be ok now, but was not the problem.

I have tested all the ground wires, smoothed them up, but they were still ok.

Then the alternator came to my mind, checked all the belts (new) and don’t seem to be that tight, started the engine, checked if the pully from the alternator is spinning, it did. After that step I with the multimeter the alternator here are the results:

(Off)Battery 13.3 V

(Running) Battery 12.5V (not charging)

(Off)Alternator 11.7 V

(Running) flipping between 0 V and 9,5 V very fast

I could not test the other 2 wires on the alternator because the wires from multimeter were not long enough.

Any thoughts? Maybe the volt-regulator or seems clear that the alternator is death..?

 

Here you go.....

 

gtx -

Sounds more like fuel than electrical to me.
Crimp in line, clogged filter, carb needle/seat, etc.

Archer