Cruise main indicator light won't turn off on Honda ridgeline

The flasher relay is most likely to be the fault, check that all indicator bulbs are good as a blown bulb can cause irregular flashing pattern

Since there is no throttle cable, there is no "cruise control" fuse. The fuses used are #7, 9,and 13 in the under hood fuse/relay box and #18 in the under dash fuse/relay box. The most common failure is a bad brake pedal switch. Does the cruise control main switch "on" light work when the switch is pressed? The gauge control module (instrument panel) and the PCM control the cruise control.

possibly the starter.

wow, 2007 and 2012 in one blue box....
or open the glove box, extract operators guide,
read that page for that lamp, bingo the name and the cause and what to do. lost the manual they are free at honda. or here.

http://justgivemethedamnmanual.com/honda/honda-ridgeline-owners-manua/
page 70, read this.... I can RTM, sure can....

quote
VTM-4 lamp (your 4wd?)
This indicator normally comes on for
a few seconds when you turn the
ignition switch to the ON (II)
position. If it comes on at any other
time, there is a problem in the 4WD
system. Take the vehicle to your
dealer to have it checked.
If the indicator blinks while driving,
the VTM-4 fluid temperature is too
high. Pull to the side of the road
when it is safe, shift to Park, and let
the engine idle until the indicator
goes out.
Continuing to drive with the VTM-4
indicator blinking may cause serious
damage to the system. (end page70)

if really DIY guy?
the then the FSM elaborates this to no end.

buy the FSM and read that. (most things on most newer cars are anything but simple)

Get down and look at parking brake assembly, If you see an electrical connector, unplug it, see if that helps? If it doesn't help or causes other issues just plug it back in.
Of course that isn't the proper fix. If something wrong with parking brake assembly, get it checked out.

It is set at the factory either it does not work or it does. They do tend to rev up fairly high to prevent any lugging and overheating the transmission. Best thing is to leave it in D and let it do it's thing.

Check with dealer most keys now days are programmed to the car you may need to have the new key programmed to your car.

one of the plastic latch linkage clips has slipped off one of the rods.
You will have to remove the inside panel with the door open the access the rods.

do you have lights?
turn on head lights if yes then next check would be starter.
Does it make any noise when you attemp to crank?

It could be the wrong bulb in the brake lights/ TS