Pulsar Chronograph 100 m - The second hand on the left small dial (not the sweep second hand of the stop watch) has begun moving erratically. It appears to move for two counts and pause for three and then move two again and then pause three again. The watch appears to still be keeping correct time. Thanks.

Click on the crown (the stem in the middle on the right side). There are three settings, and one of them will change the minute hands' behavior to normal. You might also check out this guide:

http://c01.coacdn.com/calibers/H800_condensed.pdf

Your watch is a chronograph or a watch that includes a stopwatch. Two of the three dials are for recording minutes and hours with the large sweep second hand recording seconds. Pushing the upper button starts and stops the stopwatch function. Pressing the lower resets everything to zero. The small bottome dial is the seconds hand for the watch, it always is moving.

your watch is a chronograph or stop watch. the large second hand that is pointed at 12, it is the second hand of the stop watch, it moves when you press te upper right button and it stop on that button too. when it stops the lower button is the reset. i hope i had been helped you.

To set the timer hand on these models of Pulsar watches, do the following: 
Looking at the face of the watch, there are two buttons and a crown on the right side. The TOP button is Button "A". - The BOTTOM button is Button "B".
There are 3 positions on the crown: IN (#1), FIRST CLICK (#2) & SECOND CLICK (#3).
First, pull the crown out to the second 'click' position (#3) ... This is all the way out. (STOP THERE! Pulling harder will harm your watch! Don't try to pull past position #3!)
Push and hold Button "A" for two (2) seconds. The dial will sweep around to the 12 O'clock position. You can advance the timer while the crown is in position #3 (second click out) to reset it back to the default position. 
The manual says that if you pull the crown out to position #3 while the timer is measuring, the hand will reset back to the 12 o'clock position... I haven't tried that, so I can't confirm.

Easier than you think.
Pull your Crown out to the FIRST stop (were you would normally set your date). Push the "A" button (top chrono button) for your dial at the "3 oclock" area, Push the "B" button(bottom chron button) for the second hand.

The "second" hand on this watch is not actually a 'sweep' second hand, as on other watches.
This is a timer dial. ["Stopwatch 1/5 Second Hand"]
To start/stop this, use the top button (Button "A").
To reset this dial to 12 O'clock, use Button "B", after first stopping it with Button "A".
The "second" hand is the small dial at the 9 O'clock position.
In actuality, you 'could' start this and just not stop it...  Then it would function as a "large second hand". That would be up to the owner. (it might use more battery power though... ?)

Dennis,
"Chronograph" is watch terminology for 'stop-watch'.
There are 3 small dials on the watch.  The main dial has a minute hand and an hour hand.  The big second hand on the main dial is not for the main time of the watch.  It is for measuring seconds for the stopwatch.
The 2 small dials at 10 o'clock and 2 o'clock will give you minutes and 1/10 of a seconds.  
There are 2 buttons on the side of the watch. Top Button:  Start/Stop Bottom Button: Reset
To set the chronograph to its default position, you would pull out the stem to the first position and push the buttons.  Also, pull the stem out further to the 2nd position and push the buttons.

The advice given here is accurate to a degree. When wound, a rolex daytona IS running. However, it is the running seconds hand in the small sub-dial that is actually running. In the earlier Daytonas, this sub-dial was at the 9 o'clock position on the dial, (pre-2001 series daytonas). The later daytonas, from 2001 on, use the seconds at 6 position for counting seconds. The main sweeping second hand on the watch dial will NOT start until activated by the pusher at the 2 position. That pusher needs to be unscrewed and then pushed to start the large sweeping second hand. This action, in turn, starts the remaining 2 sub-dials in motion, counting minutes and hours. To stop the chronograph function, you push the pusher @ the 2 position again, to stop the sub-dial hands from counting, and then push the pusher @ the 4 position to re-set the dials to their "straight up position". This stops the chrono's function, until it is needed again, BUT the main running seconds, (at either the 9 or 6 sub-dial position, depending on the year series of the daytona) will continue to run, thus keeping accurate time.  Hope this gives you a better idea of how the timekeeping of the chronograph function on a Daytona works. So, to start your seconds running you need to start the chrono function by pressing the pusher at the 2 position. That will allow you to see the large sweeping second hand I think you're referring to here. Hope this has helped.
Doug

The larger second hand on the Pulsar PF8036 is part of the stopwatch feature. The upper button starts/stops the stopwatch feature, and the lower button operates the lap/reset function. Why they made the larger hand work only with the stopwatch instead of the smaller hand to the left is beyond me, but that's how it is designed.