I own a Mahindra Pikup 2013 4x4. The tail lights are out and I can't find the fuse.

there are fusible links near the battery and IGN fuse near the battery
check for ground wire or loose battery terminals

Not for tail lights.
GeT a 12 Volt probe screwdriver with the handle that lights up or volt meter. Remove the bulb turn on tail lights clip to any good ground and put the probe tip on the bump at the bottom of the socket and it should lite up. Now clip ground to side wall of socket and probe both bumps in the center one bump is tail the other is brake. Have someone push on brakes and see if they light when on one bump then check tail on other bump. DO NOT TOUCH THE SIDE WITH CENTER PROB OR IT WILL SHORT BE CAREFUL. this will tell you where the problem is,

Also check fuse holder.
leave fuse in clip to ground turn on tail light and probe both ends of fuse for power.

Hope this helps Mike

1 near the battery
2 under the stearing collom [remove two screw]
3 left side under the dashbord black fuse box [six fuse]

you blew a fuse. check fuses in both fuse boxes..
ahh yes, the IP cluster lamps are dad, but not the idiot warning lights
only the parking lights in the cluster are dead. right.?
and the park-tail, running lights and dash dim lights are all the same.
my guess three is a short on the TAIL fuse, the TAIL fuse blew
and took out: park-tail, running lights and dash dim lights are all the same.
it blew. most are marked tail even thought it runs side lamps and front parking lamps... TAIL is wrong, they are parking. lamps it truth.

Just out of curiosity is there trailer lights plugin installed if so the plugin could be creating a neg ground for your lights

I had this problem with my 2007 Honda CRV -- all the lights worked EXCEPT the tail/running lights and the license plate light. The other tail lights worked -- brake, reverse, indicators, and hazards. Front headlights also worked, but when the headlights went on the back tail lights did not (not to safe for driving at night!!)
The fuse was #15 in the interior fuse box (under the dash driver side) with the label "small exterior lights" ( also check fuse #19 labeled "small lights main"). The cause of my problem, I believe, is a bad or lose wire in my license plate light.

you most likely have blown 10amp fuse for tail lights in the fuse box under the hood as far as tha tail lights go. turn your lights on and check your tail lights along with the plate lights. plate lights are on the same fuse as the tail lights. there is a fuse box by the battery which has tail light fuse in it. the lid of the fuse box is showing location of fuse. as far as your interior light goes, make sure that you have the switch in "door" position or it will not come on when door is opened. or just put it into "on" position to see if it comes on. but turn it off or put it back to "door" position/middle seting or your battery will drain down.

American cars traditionally put their dash lights and tail lights on the same fuse so that you would notice immediately when the fuse for the tail lights failed. Find the tail light fuse in your fuse box and check it.

Dear visual_ideas, Sorry to hear about your experience. We request you to kindly contact our Customercare team at customercare@mahindra.com or call on our Customer Care helpline: 02228468525/1800226006.
Thanks & Regards, Team Mahindra

Look at fuse #18, a 15 amp fuse, in the fuse block. This fuse powers both the tail lights and instrument cluster lights. Usually both of these light systems are powered by the same fuse so when your cluster isn't lit up you'll know right away that your tail lights aren't working as it's not safe to drive without tail lights. Your brake, turn, and head lamps are powered by different circuits. Hope this helps and good luck!