Grounds with fenders off

UPDATE: Okay - I have fixed that problem and now have another one that I need help on...First of all, you were right, there was a ground wire on the drivers side lights that was loose and once I tightened it - VOILA it worked.

New issues:

I have replaced all the wires in the front harness, the engine harness and the dash harness using the AAW kit....I also changed to an internally regulated Alternator thereby removing the horn relay and the voltage regulator.

When I connect the battery back, I turn the key and the gen light and comes on...When I turn the key to start the car, nothing.....The flashers work and the turn signals work..

I have 12.9 volts in the battery but when I did the ground continuity test ( thanks to the stickie) the multimeter shows 1. ( no change from when I turned it on). So I am assuming I have a ground issue.....I looked and all the ground wires on the front harness and the engine harness are connected.. The negative bat cable goes to the alternator bracket and the pigtail from the neg batt goes to the radiator support...I have not touched any of the ground straps......What is the best way to try to find out where the ground is missing???

Secondly - since I am having issues with electrical, I have removed the dash so I can double check the dash wire connections...Is there a way to test to ensure that everything is connected and getting power without putting the dash back in? What are the minimal things that have to be connected in order to power everything.. Can the system be tested without the dash in as long as things are connected like the headlight switch, ignition switch???

Thanks to everyone for your help and patience....

UPDATE: so I used my test light and tested everything...I have 12.29 volts from battery.I have power to the starter. Then I tested all the switches / connections with test light...Here are the results..
WITH KEY OFF: The following wires lit up
Rear Body Connection: Orange
Headlight Switch: Red and Orange
Brake Switch: Orange
Horn Relay: Red and Black
Turn Signal Switch: Brown and Black
Ignition Switch: Red
Radio: yellow
Glove box and Lighter: Orange

WITH KEY ON: The light lit on;
Rear Body: Light Blue and Light Green
Wiper: Black and Dark Blue
Turn Signal: Purple
Ignition Switch: Pink
Back Up switch: Pink
Radio: Tan

So here is what I was going to do...Please tell me if I am headed the right direction...
1. I am going to pull the starter and take starter and battery to Autozone and have them tested.
2. Test the wires to the starter to ensure power while the starter is off. Red should be hot all the time (Big cable from Battery) and purple should be hot with key on (From Bulkhead)
3. It is my understanding that the starter bolts ground the starter so there should not be a wire grounding it right?

Ill report back with findings....If I should do something else, please let me know...

Thanks....