What voltage would you use for a vehicle power supply?

[nobb]

I'm doing the same thing and I use about 14.0V, but only because that was the lowest I could do with the adjustable switch mode power supply I have permanently installed in my trunk.

14.5V is better for fully charging the battery as that more closely resembles the alternator voltage, however I'd stick closer to 13.5 - 13.8V if the intent is to be able to leave it on long term.

Boiling the battery once in a while at 15.5V is one of the most potent things you can do for desulfation (better than using a desulfator IMO), but that's a different topic and I would not do that with the car electronics attached.

 

[RooflessVW]

For those curious:

 

[SubLGT]

https://cloreautomotive.com/oe-specified-voltage-environment-for-reprogramming/



What to do if voltage drops too low during programming:

https://cloreautomotive.com/the-gre...wA&jobid=244fb735-faa3-4386-83b3-5edc05b2e97b

Clore has a new article on programming recovery.

Recovery from Voltage Drop

[This article] provides a breakdown by manufacturer of the best practice for recovering your programming event if the vehicle experiences a voltage drops that causes the event to abort. Obviously, the goal here is 1) get the programming routine back on track and 2.) do everything possible to not have a catastrophic failure that results in a bricked module.