wont start?

Question about this issue, I went out to start the car a week ago and the same thing happened? Installed a larger batt 800 cca and a new starter relay and it started right up. Drove it 3 times and today it does the same thing, a click when I turn the key then nothing?
no lights, horn, brake lights etc..
batt shows 12.9 volts to the starter relay and to the starter it shows 12.9. To the horn relay and to the firewall conn it shows 12.9.
inside the car, at the firewall 12.9, amp meter , light switch all show 12.9.
pulled starter switch and power wire shows 12.9?
everything is dead though?
ordered a new starter switch.
Anybody have any ideas? Car has new starter, alt, ign, etc..
thanks, john
 
Could be a bad cable. Sometimes they will show the voltage, but the resistance in the cable is so bad that it won't flow enough current to do the job.

Here's how to test:

 
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