1971 Blazer won’t start

[Shane Richardson]

Hio fellow Blazer owners! Ok, I’m stumped. My Blazer won’t start or even turn over...

Details- 1971 Blazer CST. 350. 4x4. Auto.

Battery has been checked 4 times and it registered as good. Alternator has been check as well- it’s good. New starter. New ignition switch.

One day I go out to start it and nothing. No click, no turn over, nothing. Then I hook up my 1960 Wards battery charger and booster and with it plugged in to wall power source and on “boost” mode it would turn over and start instantaneously. After that I checked all the above mentioned parts and they checked out as good. So I replaced starter which I had not done, same result. So I replace ignition switch, same tesultS now it won’t ev n start using the “boost” mode jump.

Wiring? Do I need to trace wires and maybe I find a shirt?
Fuses look good.
A relay perhaps?
Voltage regulator?

I’m stumped and could use some advice!

Thanks, Shane
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