Turn signal issue
 

On my 64 GTO, when I turn on the left turn signal the left rear signal and the dash indicator flash but no front left flash. When i turn on the right signal the front and rear right signals flash but the dash indicator doesn't. I've checked the left front bulb and it is good.
Thanks in advance for the help.

I had something very similar in my 66 GTO found out the turn signal wire coming out of the firewall connector was loose. Shimmed it and all is well. Hope this helps.
Thanks,
Fred

Your flash bulb in the dash maybe burnt out or not making a good connection on the printed circuit board that's mounted behind your gauges. Or worse, there could be a break in the copper trace that sends power to that bulb or the pin connection is poor.

Make sure the bulbs have a good ground. :)

Update
 

It was a loose bulkhead connector. After a little wiggling the blinkers and dash indicator all work. thanks for the help.