I have the same power supply and daughter board. I beleive I followed the instructions to a T but it will not maintain 14.3v as soon as I put any load to it. It drops within minutes.

Has anyone else ran into this and solved it?

 

The PSU will put out about 14.6V if the DIY is followed. Once you connect the PIWIS to the car, the voltmeter in the cluster will show about 14.1V. Maybe your soldering was off (it’s tiny in there)?

 

Problem solved - basically poor attention to detail LOL
I also used 1/4" bolts to connect the cables, but the problem was an oversized hole in the connector. it moved on the stud and shorted against the chassis. I did have electrical tape between but it wasn't enough.

New connectors with smaller holes, replaced the resistor, problem solved! works like a champ now

 

Thanks for following up and glad it’s working for you now. So nice not to worry about the voltage when coding the car! It’s a great little tool!

 

Hi,
New member and a really great thread. Thanks to all that made this ! Super video as well !

I am looking to do this....but Porsche asks for 90A min for some cars. I understand this recommended module has MAX current of 62A @ 12VDC

DELTA DPS-750EB

Is there a more powerful server module??
thank you

 

I've this alimentation since two years and it's very good for piwis : https://fr.aliexpress.com/item/1005002843829663.html?spm=a2g0o.order_list.order_l ist_main.72.56b55e5braMOre&gatewayAdapt=glo2fra]13.8V - 600W

 

Glad you found my DIY helpful. I’ve never had a low voltage warning when using this PSU with my PIWIS. I suspect if will work fine for whatever application you throw at it.

 

VKB123, Thank you for the research and the write up as well. I have a 992 with the LiPo battery. Would you foresee issues with this PS and that battery? I understand the battery has some Porsche proprietary electronics built into the battery.

 

That I do not know. Sorry.

 

Okay, thank you,
Best,
Karl

 

Hi Marc,
So if I buy that source I don't have to make any internal modifications, i.e. connect terminals to source and then to car and list, right?

I have a 2017 cayenne and I'm a bit scared to connect that type of fountain directly to the car, in case I burn a module or something happens, but if you have it without problems I'm a little calmer.

Another option I had thought of was to charge an external battery that I have at full strength and use a 5a slow charger, then the fully charged source will act as an extra lung in case it will need an excess of energy, I don't know if that is true at all. Thank you very much for your help

 

No you can buying it. You connect it and you can use piwis withour problem.
It's impossible broken module because you have the car battery that protect you.
The new link for this : https://www.aliexpress.com/item/1005001340185121.html?spm=a2g0o.productlist.main.1 .16a71R6l1R6lXz&algo_pvid=ad54db49-aa4f-4c3a-8f06-41b805022b45&algo_exp_id=ad54db49-aa4f-4c3a-8f06-41b805022b45-0&pdp_npi=4%40dis%21EUR%2129.42%2120.59%21%21%2131 .26%2121.88%21%40211b61bb17061948936953269e9ef1%21 12000015745190805%21sea%21FR%210%21AB&curPageLogUi d=ka9xshi1bXZv&utparam-url=scene%3Asearch%7Cquery_from%3A]HERE

 

I have been working on this for a while and am still stuck near step 1.

1. Solder a bridge between pins 70 and 69. Then solder a jumper wire from these connected pins to ground. This will power on the PSU

When joining 69 and 70, I over soldered these and ended up pulling the contacts off the board. After much struggle trying to get this corrected, I have been wondering if I can use the contacts on the bottom of the board for the same purpose.

hopefully someone can confirm before I attempt this again.

 

Hi. I’m not sure if soldering from the bottom of the board will work. Give it a try. I don’t think you have much to lose since the contacts on the front side are buggered. Sorry, can’t be more help. Good luck.

 

I have my power supply up and running after a few rookie mistakes getting the alligator clips hooked up!

My question now is regarding the output voltage. When it's on the desk and not connected to anything it reads 14.4V and when I hook it up to my Cayenne, it drops to 11.3 - 11.7. I have moved the little dial on the side to get max voltage (14.4) but it's just not putting out enough power to the car. I used 2AWG wire, so wondering if maybe that's the reason it's struggling to deliver enough power? Hoping to get someone with more electrical experience than I have to weigh in!