Frankly, the moment i move the turn signal switch my cluster dims. Whether its for left or right, both front and rear bulbs just light up. Ive noticed that while its idling and i give it gas my cluster gets slightly brighter and my headlights get brighter. When driving, the gauge for my battery or voltage centers(headlights on). While on idle the needle stays centered but the moment i turn on my headlights it drops down close to the red area. Now my first assumption was a bad alternator but i did a charging/starting test and the alternator tested good. Could this also be affecting my turn signals?
Yes, a low voltage would cause the flasher not to work.
You need to beg, borrow or buy a voltmeter or DVM. Places like Harbor Freight have cheap ones that will work for simple tests like you'll do to find your problem.
Check the voltage across the battery terminals with all the electrical turned on and the engine running about 1200 RPM. You should see 13.8-14.2 volts
If the voltage check is good, then the problem is likely a bad ground. Here's some help in that area...
Grounds
Revised 28-Oct-2012 to add signal ground description & possible problems if it is bad
Grounds are important to any electrical system, and especially to computer controlled engines.
In an automobile, the ground is the return path for power to get back to the alternator and battery.
Make sure that all the ground places are clean and shiny bare metal: no paint, no corrosion.
1.) The main power ground is from engine block to battery: it is the power ground for the starter & alternator.
2.) The secondary power ground is between the back of the intake manifold and the driver's side firewall. It is often missing or loose. It supplies ground for the alternator, A/C compressor clutch and other electrical accessories such as the gauges. The clue to a bad ground here is that the temp gauge goes up as you add electrical load such as heater, lights and A/C.
Any car that has a 3G or high output current alternator needs a 4 gauge ground wire running from the block to the chassis ground where the battery pigtail ground connects. The 3G has a 130 amp capacity, so you wire the power side with 4 gauge wire. It stands to reason that the ground side handles just as much current, so it needs to be 4 gauge too.
The picture shows the common ground point for the battery , computer, & extra 3G alternator ground wire as described above in paragraph 2. A screwdriver points to the bolt that is the common ground point.
The battery common ground is a 10 gauge pigtail with the computer ground attached to it.
Picture courtesy timewarped1972
Correct negative battery ground cable.
See http://assets.fluke.com/appnotes/automotive/beatbook.pdf for help for help troubleshooting voltage drops across connections and components. Be sure to have the maximum load on a circuit when testing voltage drops across connections. As current across a defective or weak connection, increases so does the voltage drop. A circuit or connection may check out good with no load or minimal load, but show up bad under maximum load conditions. .
Voltage drops should not exceed the following:
200 mV Wire or cable
300 mV Switch
100 mV Ground
0 mV to <50 mV Sensor Connections
0.0V bolt together connections