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Old 16th March 2023, 17:49   #1
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DIY Installation | 12v rear power socket

Tata is keen on cost-cutting, and lemedico is keen on DIYing! In continuation with my multiple jobs on this car, I set about to replenish another lost feature on the Tiago. Now I cannot say for sure if the older models had a power outlet in the rear, and then later lost it, along with a lot of other conveniences. But there surely was a dedicated cut-out in the centre console for one.

A few YouTube videos were suggesting that the wiring is present, and one simply needed to buy a socket. A plug-and-play would be enough. However, I was not sure if my car had the wiring loom and I also did NOT want to dismantle my centre console. I thought a fresh circuit creation from the secondary fuse box would be easier. And indeed, it was.


Here is a list of things you need to do it:

1. A car with an absent 12v power outlet.

2. A power outlet from the aftermarket. I got mine off Amazon instead of Boodmo. Costs less and is really good quality. It came with two straight thimbles as well.
https://www.amazon.in/gp/product/B07...?ie=UTF8&psc=1

3. 1.6 meters of wire, 1 sqmm.

4. A mini-type fuse tap. This size is specific for the Tata cars. https://www.nexdigitron.com/products...pr_seq=uniform

5. A wire thimble for the chassis bolt grounding/negative connection.

6. A multimeter to determine which fuse is appropriate to tap in to.

7. DIY toolkit with the usual things.

8. Pry tool set, optional.

I would like to shout out to fellow TBHPian sagarpadaki, whose thread on the same DIY gave me help to do it as well. I would like to mention that my method is much less tedious as I do not remove any parts of the centre console

https://www.team-bhp.com/forum/diy-d...-my-tiago.html (DIY: Installing a rear 12V accessory socket in my Tiago)

DIY Installation | 12v rear power socket-11.jpg

DIY Installation | 12v rear power socket-10.jpg

1. Park your vehicle, and remove the keys. Experts say disconnect the negative terminal of your battery but I kept mine connected.


2. Pull out the fascia panel over the secondary fuse box by your right knee. I chose fuse number F11 which had a 5A EPAS marking, and was not powered during ignition off. This is important to check to avoid trickle discharge of the battery.

DIY Installation | 12v rear power socket-15.jpg

3. I swapped the 5A fuse on the fuse tap with a spare 15A fuse from the primary fuse box in the engine bay. This was in anticipation of the current draw of the accessories that would be used.

DIY Installation | 12v rear power socket-22.jpg

4. I have a rear armrest DIY installed on the Tiago so I had to dismantle that to access the space around the rear power outlet.

https://www.team-bhp.com/forum/diy-d...ata-tiago.html (DIY: Armrest installation for Rs. 1800 (Tata Tiago))



For those who do not have it, all you need to do is pull/pry out the rear cup holder and it opens up a vast space to work with.


5. Snake the wire from the rear end of the centre console towards the gear shifter. Grab it and snake it further towards the steering column and then up to the secondary fuse box. Tuck in the wire and zip tie it to the dashboard as needed.


6. Connect the fuse tap to the wire end and piggyback it to the desired fuse. Put the fascia panel back on.


7. Ground connection is made with a piece of wire 4-5 inches long. I grounded it to one of the bolts holding down the handbrake mounting plate which was loosened up with a 10mm socket.

DIY Installation | 12v rear power socket-14.jpg

DIY Installation | 12v rear power socket-18.jpg

DIY Installation | 12v rear power socket-19.jpg

DIY Installation | 12v rear power socket-20.jpg

8. Identify the + and – terminals on the 12v socket and connect the corresponding wires the respective straight thimbles. Crimp them down strong with some pilers.



DIY Installation | 12v rear power socket-16.jpg
DIY Installation | 12v rear power socket-13.jpg
DIY Installation | 12v rear power socket-17.jpg



9. Test fire the power socket to see if it works, and holds the plug well.


10. Fit the socket into the slot. This particular socket I bought from amazon has a ribbed shaft and was really tight to push in. but it got there eventually!

DIY Installation | 12v rear power socket-12.jpg


11. Re-install the armrest, vacuum the carpets, tidy up and you are done!

DIY Installation | 12v rear power socket-21.jpg


I spent around Rs. 500 in all. Rs. 299 for the socket, Rs. 150 for the fuse tap and Rs. 50 for the wire. One may spend more if he/she choses to buy Tata branded chrome ringed illuminated sockets. But I was not too bothered about the appearance, as it stays concealed under the armrest. I will be using it permanently for the ventilated seat cushion in the summer, and then a heated + massage seat cushion in the colder months.






Here is the YouTube upload on the same


Last edited by lemedico : 16th March 2023 at 18:03. Reason: added more content
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Old 17th March 2023, 13:28   #2
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re: DIY Installation | 12v rear power socket

Very nicely done
Coincidentally, we too got those exact same 12v marine sockets installed in our Creta and for the exact same purpose of running ventilated seats/covers.
DIY Installation | 12v rear power socket-12v-sockets.jpg
DIY Installation | 12v rear power socket-12v-ventilated-seats.jpg

However, instead of going the fuse-tap route, we decided to go for a separate connection to the battery since these same 12v marine sockets would be used for the solar battery charging system while car-camping as well. We got these 12v sockets from Aliexpress for around INR 31 each including delivery charges in 2018 but alas, no more
Quote:
Originally Posted by lemedico View Post
I chose fuse number F11 which had a 5A EPAS marking, and was not powered during ignition off. This is important to check to avoid trickle discharge of the battery.
You are absolutely correct here but on the downside, it would not be safe to draw more than around 5 amperes of current from the 12v socket unless you are absolutely sure that the stock wiring can handle that much current. So plugging in a 12v vacuum cleaner and/or a 12v tyre inflator into this 12v socket could be a risky affair. This was another reason why we chose to go for a totally independent wiring connection to the battery through a fuse and a switch as you can see below.

DIY Installation | 12v rear power socket-12v-fuse.jpg

DIY Installation | 12v rear power socket-12v-switch.jpg
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Old 17th March 2023, 15:29   #3
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re: DIY Installation | 12v rear power socket

Quote:
Originally Posted by Chhanda Das View Post

You are absolutely correct here but on the downside, it would not be safe to draw more than around 5 amperes of current from the 12v socket unless you are absolutely sure that the stock wiring can handle that much current. So plugging in a 12v vacuum cleaner and/or a 12v tyre inflator into this 12v socket could be a risky affair. This was another reason why we chose to go for a totally independent wiring connection to the battery through a fuse and a switch as you can see below.

Thanks for your appreciation. Aliexpress.com was a DIYers pornhub. Ended too soon.

You're right about the risks of drawing a higher current. I am certain that all I'm ever going to run off it is my seat cushion. I don't think it's drawing a high ampere anyway. The tyre inflator which I regularly use, will be powered from the front socket.
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Old 17th March 2023, 16:02   #4
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re: DIY Installation | 12v rear power socket

Quote:
Originally Posted by lemedico View Post
You're right about the risks of drawing a higher current. I am certain that all I'm ever going to run off it is my seat cushion. I don't think it's drawing a high ampere anyway.
I hope that your setup performs swimmingly. My only concern here is that something as critical as the electric power assisted steering (EPAS) is not starved of power apart from the obvious risks of a fire hazard. If I remember correctly, my car's ventilation seat/cover draws approximately 1 ampere at 12 volts in the highest speed setting of the ventilation mode. The one in my car does not have the massage or heating functionality. In massage and/or heating mode, the power draw should increase substantially. So you might want to check that too. I hope this helps and I wish you the best.

Also, I am jealous of your Cambridge accent

Last edited by Chhanda Das : 17th March 2023 at 16:12.
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Old 17th March 2023, 19:45   #5
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re: DIY Installation | 12v rear power socket

Quote:
Originally Posted by Chhanda Das View Post
I hope that your setup performs swimmingly. My only concern here is that something as critical as the electric power assisted steering (EPAS) is not starved of power apart from the obvious risks of a fire hazard. If I remember correctly, my car's ventilation seat/cover draws approximately 1 ampere at 12 volts in the highest speed setting of the ventilation mode. The one in my car does not have the massage or heating functionality. In massage and/or heating mode, the power draw should increase substantially. So you might want to check that too. I hope this helps and I wish you the best.

Also, I am jealous of your Cambridge accent
The same thought crossed my mind too, but at the time, the eagerness to complete the job made me select that particular fuse. I shall investigate for a different one this weekend and swap it out probably.

I had a wide grin when I read your last sentence
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