RE: Lets hear about your Thunder Tiger Neptune SB-1.
Thats a great price at LHS ! I paid a t less than that way back about 2 years ago with free shipping.
If only the radio togle was broken its easy to fix.
Yes I can give some info on the LED mod and action cam.
First I would select the leds that are pree wired for 12 vdc operation,that way you won't have to install resistors to drop down the voltage.
Then select where you want them and how ,many,I even have them inside of the casing in the side windows and fascing downward ,4 large super bright ones.
To install them remove the left and right outer hulls halfs in yellow ,no need to remove the aft cone.Drill to the right size to hold them and then glue them in place with Goop not CA as it will haze over the clear lenz of the LED and Goop will seal the back side of the LED from moisture.
I have about 28 on this sub and so far none have burned out.Then consolidate and tidy up the wireing so that the 2 halfs can be easily removed and installed by glueing in spots the wires to the hull ,you have to sualder the positive to positive leads once pre cut to length so that its nice and tidy use wire straps if necessary same for the negative leads to all lead or terminate at the under bow area where the off on switch is.There install a watertight mini connector maid by the same company that makes electrical parts for the scale train folks avialble also at the hobbyshop,there very small and have an internal O ring,they work so very well.There must be one there so that when the nose comes off there is a connection to all of the external LEDS.
I then attached a wire from the main circuit bourd that has those screw type terminals,use your voltage meter to find which one has the switched power on .Then another from the negative batery terminal to meet up with the positive wire and then sauldered to the larger main cannon plug connector ill show a new picture of that mod,there marvaluse and realy do the job,military speck and maid to last, I have some for sail.
This plug is installed on the clear thick forward bulkhead in the lower section so that its out of the way of the camara when the nose is on.
Be sure to double check your connections or you could burn out alot of LEDs!,Then once they work be sure to seal the connections with Goop.
Then iether use the negative or positive side to use for the remote switching of the lights.I installed the switch and servo in the aft section close to the other aft servos on the rib sopport where ever there is enogh flat space with servo tape.Now you can use an electronic switch as well but for one servo and a glued on microw switch adjusted since the radio does not have servo adjustments it just works for alot less.
Then there is the camara ,the first one i used was the Action Camara ,its OK but not realy that good as it colud be the optics underwater just arent what I like so I use a water tight color infrared night camara 1/4 inch non CMOS type that makes an awsome clear picture and has an extra wide angle lenz.,there available on Ebay.
This is powered by the main batery via the above connector along with the signal is also passed into the sub where a microw DVR records the action.
The wireless vertion is self contained except for the power supply,but its not installed now.Later ill return to it.
See dia gram for details.