I bought the 79 power wagon with a 318 >360 swap I can't get reliable power to the key. I have replaced the ignition switch, starter with selinoid, starter relay, and neutral safety switch. Checked all the wires none are visibly bad . Checked all the obvious grounds and still no luck. Very randomly u get power up to the key and get the truck to start but I can't trust it to start again . Any suggestions would be welcome. Ty in advance

 

Check the bulkhead connector where the wires go through the firewall.

 

Amp meter.
Check the connections to the amp meter.

 

I had a similar problem and it wound up being one of the 2 grounds on the front wiring harness.

 

Check this... And then call us back...
http://www.madelectrical.com/electri...p-gauges.shtml