BEFORE you call Roadside Assistance (dead battery)
11-18-2023 | 11:45 AM
#1
Thread Starter
Intermediate
Joined: Mar 2011
Posts: 27
Likes: 22
From: Winston-Salem, NC
BEFORE you call Roadside Assistance (dead battery)
To open the frunk to access a dead battery... DON'T USE A "JUMP PACK" !
My 992 GT3's Li-Ion battery died, but none of my NOCO jump packs or "smart" charger would open the frunk when connected to the red dongle in the driver footwell fuse box.
Why? Those devices are microprocessor controlled, and need to sense a current draw to work.
Jumping the red dongle from a regular 12V battery (another car with jumper cables) worked just fine! RED to the dongle, BLACK to the door hinge. See YouTube videos for "992 Dead Bettery"
You CAN'T open the Frunk using the Switch in the Door Sill
The red dongle in the fuse box does NOT connect to the car's electrical system... it ONLY connects to the frunk release receiver and latch.
You must use your key fob .to open it, because the door sill frunk switch gets no power from the dongle.
Next... my "smart" Li-Ion charger would not revive Porsche's battery. Microprocessor controls again. It connected and charged for a brief period, then shut down. So...
I jump started the car from our Cayenne with jumper cables. RED to the 992 battery's + post, BLACK to the indicated chassis ground (NOT directly to the battery).
Then I took the car on a spirited drive, 20 miles or so, keeping the revs up. The voltmeter went up to 14.3, and finally settled at 13.5.
I pulled into the garage, and opened the frunk before I shut the car off.
The next morning, I hooked up the charger and it soon settled into its "maintainer" role... battery fully charged.
These things I learned in a frustrating three hours or so... sometimes our tools are too "smart" for their own good!
My 992 GT3's Li-Ion battery died, but none of my NOCO jump packs or "smart" charger would open the frunk when connected to the red dongle in the driver footwell fuse box.
Why? Those devices are microprocessor controlled, and need to sense a current draw to work.
Jumping the red dongle from a regular 12V battery (another car with jumper cables) worked just fine! RED to the dongle, BLACK to the door hinge. See YouTube videos for "992 Dead Bettery"
You CAN'T open the Frunk using the Switch in the Door Sill
The red dongle in the fuse box does NOT connect to the car's electrical system... it ONLY connects to the frunk release receiver and latch.
You must use your key fob .to open it, because the door sill frunk switch gets no power from the dongle.
Next... my "smart" Li-Ion charger would not revive Porsche's battery. Microprocessor controls again. It connected and charged for a brief period, then shut down. So...
I jump started the car from our Cayenne with jumper cables. RED to the 992 battery's + post, BLACK to the indicated chassis ground (NOT directly to the battery).
Then I took the car on a spirited drive, 20 miles or so, keeping the revs up. The voltmeter went up to 14.3, and finally settled at 13.5.
I pulled into the garage, and opened the frunk before I shut the car off.
The next morning, I hooked up the charger and it soon settled into its "maintainer" role... battery fully charged.
These things I learned in a frustrating three hours or so... sometimes our tools are too "smart" for their own good!
11-18-2023 | 12:17 PM
#2
Rennlist Member
Joined: Mar 2015
Posts: 1,953
Likes: 1,257
From: The Balkans
Those Li-ion jumper packs only work if there is enough juice in the battery to trigger the jumper to work. I got rid of my NOCO and went back to a lead acid jumper box. Works a million times better.
11-18-2023 | 12:45 PM
#3
Race Car
Joined: Jan 2004
Posts: 3,972
Likes: 1,235
From: santa barbara
I have two jump packs and they both have the ability to put out 12 V.
I would assume that should work. I’m not talking about jumping the car just getting the trunk open.
I’ve checked with a voltmeter and you can get voltage out same as you would. A battery.
I thought it would work?
The Gt3 has been OK but I just picked up a GTS with an AGM battery.
My last S had with an AGM crapped out on me.
We’ll see ,
I would assume that should work. I’m not talking about jumping the car just getting the trunk open.
I’ve checked with a voltmeter and you can get voltage out same as you would. A battery.
I thought it would work?
The Gt3 has been OK but I just picked up a GTS with an AGM battery.
My last S had with an AGM crapped out on me.
We’ll see ,
11-18-2023 | 04:49 PM
#5
Rennlist Member
Joined: Jan 2013
Posts: 4,313
Likes: 1,301
From: West Vancouver and San Francisco
It's dead simple - you need to supply 12V. Any supply will work. Many NOCOs have 12V supply mode (all current ones do, even the $40 one), which is different from battery charging. Sometimes you need to leave it connected for a few minutes before trying to open but it does open. Same with starting - jumpstart-capable supplies are the best because they would start the car right away, and then you can charge by driving or connecting any charger, and it will keep going. Without a jump-starter, it's also possible with most chargers, just takes more care. It's best to have a jumpstart-capable charger or a charger with 12V amp boost mode (e.g., NOCO G15000 did the job every time for me) - it takes 2 minutes to boost a car with either, but with jumpstarter, it's just dead-simple.
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11-18-2023 | 05:05 PM
#6
Rennlist Member
Joined: Jan 2013
Posts: 4,313
Likes: 1,301
From: West Vancouver and San Francisco
I have two jump packs and they both have the ability to put out 12 V.
I would assume that should work. I’m not talking about jumping the car just getting the trunk open.
I’ve checked with a voltmeter and you can get voltage out same as you would. A battery.
I thought it would work?
,
I would assume that should work. I’m not talking about jumping the car just getting the trunk open.
I’ve checked with a voltmeter and you can get voltage out same as you would. A battery.
I thought it would work?
,
Last edited by MaxLTV; 11-18-2023 at 05:06 PM.
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11-18-2023 | 08:21 PM
#8
Rennlist Member
Joined: Jun 2011
Posts: 5,684
Likes: 4,030
From: Santa Cruz, CA
To open the frunk to access a dead battery... DON'T USE A "JUMP PACK" !
My 992 GT3's Li-Ion battery died, but none of my NOCO jump packs or "smart" charger would open the frunk when connected to the red dongle in the driver footwell fuse box.
Why? Those devices are microprocessor controlled, and need to sense a current draw to work.
Jumping the red dongle from a regular 12V battery (another car with jumper cables) worked just fine! RED to the dongle, BLACK to the door hinge. See YouTube videos for "992 Dead Bettery"
You CAN'T open the Frunk using the Switch in the Door Sill
The red dongle in the fuse box does NOT connect to the car's electrical system... it ONLY connects to the frunk release receiver and latch.
You must use your key fob .to open it, because the door sill frunk switch gets no power from the dongle.
Next... my "smart" Li-Ion charger would not revive Porsche's battery. Microprocessor controls again. It connected and charged for a brief period, then shut down. So...
I jump started the car from our Cayenne with jumper cables. RED to the 992 battery's + post, BLACK to the indicated chassis ground (NOT directly to the battery).
Then I took the car on a spirited drive, 20 miles or so, keeping the revs up. The voltmeter went up to 14.3, and finally settled at 13.5.
I pulled into the garage, and opened the frunk before I shut the car off.
The next morning, I hooked up the charger and it soon settled into its "maintainer" role... battery fully charged.
These things I learned in a frustrating three hours or so... sometimes our tools are too "smart" for their own good!
My 992 GT3's Li-Ion battery died, but none of my NOCO jump packs or "smart" charger would open the frunk when connected to the red dongle in the driver footwell fuse box.
Why? Those devices are microprocessor controlled, and need to sense a current draw to work.
Jumping the red dongle from a regular 12V battery (another car with jumper cables) worked just fine! RED to the dongle, BLACK to the door hinge. See YouTube videos for "992 Dead Bettery"
You CAN'T open the Frunk using the Switch in the Door Sill
The red dongle in the fuse box does NOT connect to the car's electrical system... it ONLY connects to the frunk release receiver and latch.
You must use your key fob .to open it, because the door sill frunk switch gets no power from the dongle.
Next... my "smart" Li-Ion charger would not revive Porsche's battery. Microprocessor controls again. It connected and charged for a brief period, then shut down. So...
I jump started the car from our Cayenne with jumper cables. RED to the 992 battery's + post, BLACK to the indicated chassis ground (NOT directly to the battery).
Then I took the car on a spirited drive, 20 miles or so, keeping the revs up. The voltmeter went up to 14.3, and finally settled at 13.5.
I pulled into the garage, and opened the frunk before I shut the car off.
The next morning, I hooked up the charger and it soon settled into its "maintainer" role... battery fully charged.
These things I learned in a frustrating three hours or so... sometimes our tools are too "smart" for their own good!
Audi eTron - start the vehicle
2020 Taycan (3x times) - open frunk & start the vehicle
2022 911 TurboS Cab - open frunk & start the vehicle
2018 911 GT3 (2x times) - open frunk & start the vehicle
I had to press the "boost" button…
I think YMMV in this situation - but I've had no problems using NOCO's to open the frunk and then using the same NOCO to actually start the vehicle.
not sure what the problem was in this case, but they do not universally fail - I agree a known good 12V battery should also work and less complex than a NOCO - but I don't mind hauling a NOCO with me in the car (for dead battery if I'm ever away from home) - not sure I want to haul a dedicated 12V battery with me in my vehicles.
YMMV
