Question: Old car was converted to 12V years ago — wiring is a mess

Don't clear the alert just to make the screen pretty. Leave the alerts on the 2025 Porsche Macan so service can see what you saw. Then you'll know the next fork. A shop burned me once by skipping that step. Next check is the cheap one I can do in a driveway.

Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. I'd do that before spending real money. This is from a 2025 Porsche Macan in Las Vegas with 22,000 miles. Verbal 'we'll take care of it' is not a plan. If that fails I'll eat the diagnostic fee.

It did old car was converted to 12v years twice this week, both times after sitting. No change in mileage feel. Doing the boring step first on purpose.

Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2025 Porsche Macan — site sharing and pack temp change the curve a lot. I'd do that before spending real money. Learned this the expensive way on a previous car. I already checked the easy fluid levels.

Don't clear the alert just to make the screen pretty. Leave the alerts on the 2025 Porsche Macan so service can see what you saw. I'd do that before spending real money. A shop burned me once by skipping that step. Not trying to scare you — just skip the expensive first guess. No warning lights, which is why I'm documenting it.

Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. I'd do that before spending real money. Learned this the expensive way on a previous car. I'll update if anything new shows up.

I'd treat 12V warnings as a no-ignore. On the 2025 Porsche Macan, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. I'd do that before spending real money. On “old car was converted to 12v years,” that was the fork that mattered for me. Parts cannon is a personality type I try to avoid. This is the filter I use when the thread starts repeating itself. No warning lights, which is why I'm documenting it.

Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. Then you'll know the next fork. This is from a 2025 Porsche Macan in Las Vegas with 22,000 miles. Stop there until you know. A day of patience here is cheaper than a wrong part. I'm keeping receipts and dates in one folder.

Cleared nothing. I want service to see the alert on the 2025 Porsche Macan first. I'm in no rush to be a hero on it.

Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. That's where I'd start. A shop burned me once by skipping that step. A day of patience here is cheaper than a wrong part. Not interested in a five-hour wait for a shrug.

OP update: scanned the 2025 Porsche Macan again and still only have the one pending code, no new lights. I refuse to clear codes until someone else sees them.

Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2025 Porsche Macan — site sharing and pack temp change the curve a lot. I'd do that before spending real money. Learned this the expensive way on a previous car. Cold start is when I can actually reproduce it.

It did old car was converted to 12v years twice this week, both times after sitting. No change in mileage feel. Next check is the cheap one I can do in a driveway.

Don't clear the alert just to make the screen pretty. Leave the alerts on the 2025 Porsche Macan so service can see what you saw. That's where I'd start. Stop there until you know. Doing the boring step first on purpose.

I'd treat 12V warnings as a no-ignore. On the 2025 Porsche Macan, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. I'd do that before spending real money. On “old car was converted to 12v years,” that was the fork that mattered for me. Time, temperature, and whether it's in gear are the notes that actually help a shop. If your situation is the opposite, ignore me. If this is nothing, great. I want that in data.

Don't clear the alert just to make the screen pretty. Leave the alerts on the 2025 Porsche Macan so service can see what you saw. I'd do that before spending real money. That's the whole play. Next check is the cheap one I can do in a driveway.

Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. That's where I'd start. Learned this the expensive way on a previous car. I'd rather look cautious in this thread than stuck later.

Tried a second charger / second scan and the story on the 2025 Porsche Macan didn't change. Next check is the cheap one I can do in a driveway.

Don't clear the alert just to make the screen pretty. Leave the alerts on the 2025 Porsche Macan so service can see what you saw. That's where I'd start. This is from a 2025 Porsche Macan in Las Vegas with 22,000 miles. Time, temperature, and whether it's in gear are the notes that actually help a shop. Not trying to scare you — just skip the expensive first guess. Trying not to diagnose from the couch.

Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. Then you'll know the next fork. This is from a 2025 Porsche Macan in Las Vegas with 22,000 miles. Learned this the expensive way on a previous car. Video is ugly but it shows the hesitation.

OP update: scanned the 2025 Porsche Macan again and still only have the one pending code, no new lights. Next check is the cheap one I can do in a driveway.

I'd treat 12V warnings as a no-ignore. On the 2025 Porsche Macan, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. I'd do that before spending real money. On “old car was converted to 12v years,” that was the fork that mattered for me. A shop burned me once by skipping that step. I already checked the easy fluid levels.

Don't clear the alert just to make the screen pretty. Leave the alerts on the 2025 Porsche Macan so service can see what you saw. That's where I'd start. This is from a 2025 Porsche Macan in Las Vegas with 22,000 miles. The universe charges extra for guessing. If this is nothing, great. I want that in data.

I'd treat 12V warnings as a no-ignore. On the 2025 Porsche Macan, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. Then you'll know the next fork. On “old car was converted to 12v years,” that was the fork that mattered for me. Parts cannon is a personality type I try to avoid. This is the filter I use when the thread starts repeating itself. I'll update if anything new shows up.

It did old car was converted to 12v years twice this week, both times after sitting. No change in mileage feel. I refuse to clear codes until someone else sees them.

I'd treat 12V warnings as a no-ignore. On the 2025 Porsche Macan, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. I'd do that before spending real money. On “old car was converted to 12v years,” that was the fork that mattered for me. If they can't show the line item, I assume it's hiding. If your situation is the opposite, ignore me. Might be overthinking it, but I'd rather overthink than overspend.

Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2025 Porsche Macan — site sharing and pack temp change the curve a lot. I'd do that before spending real money. Learned this the expensive way on a previous car. I've seen both outcomes, which is why I'd test instead of assume. I refuse to clear codes until someone else sees them.

Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. Then you'll know the next fork. Stop there until you know. A day of patience here is cheaper than a wrong part. Trying not to diagnose from the couch.

I'd treat 12V warnings as a no-ignore. On the 2025 Porsche Macan, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. I'd do that before spending real money. On “old car was converted to 12v years,” that was the fork that mattered for me. If they can't show the line item, I assume it's hiding. If your situation is the opposite, ignore me. I'm in no rush to be a hero on it.

Low-voltage gremlins will strand you even with a full pack. Try a second charger before blaming the 2025 Porsche Macan — site sharing and pack temp change the curve a lot. That's where I'd start. Keep sale price, fees, and rate as three different conversations. That's my plan before I call anyone.

Charge curves lie if you don't match starting SOC and temp. Match starting SOC and battery temp if you're comparing 2025 Porsche Macan charge sessions. I'd do that before spending real money. This is from a 2025 Porsche Macan in Las Vegas with 22,000 miles. Learned this the expensive way on a previous car. Only after sitting overnight so far.