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#3393264 - 06/09/14 06:09 PM 40AMP + Charger/Power Supply
Ndx Offline


Registered: 04/04/08
Posts: 1773
Loc: IL
Hi Guys,

For programming ECU's most manufactures require a Charger to be plugged in the car 40AMP +
Any recommendation's ?

There are so many on Amazon.

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#3393269 - 06/09/14 06:22 PM Re: 40AMP + Charger/Power Supply [Re: Ndx]
eljefino Offline


Registered: 06/15/03
Posts: 29581
Loc: ME
40 amp is ridiculous. I understand wanting to keep things alive so the battery doesn't go kaput during a reflash but 6 amps is more than enough. I'd worry about 60 hz noise getting into the system if you crank it up too much.

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#3393285 - 06/09/14 06:32 PM Re: 40AMP + Charger/Power Supply [Re: Ndx]
901Memphis Offline


Registered: 08/14/10
Posts: 10953
Loc: Northern Kentucky
http://www.walmart.com/ip/Diehard-15A-Automotive-Battery-Charger/16550309

I have one of these I got at Meijer for $40 but they sell them at Walmart too and Amazon.

I can't imagine this not being enough with a 15 amp automatically controlled charge it works great on my batteries and charges them perfectly every time.

It's probably important to keep fully charge the battery before you begin too.

If you insist on a 40 amp charger this black and Decker looks pretty solid but pricy.

http://www.autobarn.net/black-and-decker...CFVJnOgodpjUALw


_________________________
2002 Buick Century 125k - Built 4T65e(Maxlife) - Syn Frankenbrew + XG 3387A
1998 Nissan Altima 335k - 5MT - M1 HM 5w30/Fram Ultra XG7317+MOS+ATP 205

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#3393294 - 06/09/14 06:39 PM Re: 40AMP + Charger/Power Supply [Re: Ndx]
Ndx Offline


Registered: 04/04/08
Posts: 1773
Loc: IL
As much as I think that 40A is a lot but ... Porsche thinks that its minimum ...

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#3393307 - 06/09/14 06:49 PM Re: 40AMP + Charger/Power Supply [Re: Ndx]
901Memphis Offline


Registered: 08/14/10
Posts: 10953
Loc: Northern Kentucky
_________________________
2002 Buick Century 125k - Built 4T65e(Maxlife) - Syn Frankenbrew + XG 3387A
1998 Nissan Altima 335k - 5MT - M1 HM 5w30/Fram Ultra XG7317+MOS+ATP 205

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#3393322 - 06/09/14 06:59 PM Re: 40AMP + Charger/Power Supply [Re: Ndx]
drolds Offline


Registered: 02/04/14
Posts: 75
Loc: KS, USA
I agree with eljefino, 40amps is ridiculous. What is the source of this recommendation? 40 amps is more appropriate for boosting a discharged battery to start the car. 6amps should do for programming.

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#3393330 - 06/09/14 07:01 PM Re: 40AMP + Charger/Power Supply [Re: Ndx]
Ndx Offline


Registered: 04/04/08
Posts: 1773
Loc: IL
This is official information from service manual

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#3393340 - 06/09/14 07:08 PM Re: 40AMP + Charger/Power Supply [Re: Ndx]
Rand Offline


Registered: 08/20/03
Posts: 10562
Loc: NE,Ohio
40amps will smoke your battery fast with the wrong charger.
_________________________
2015 Forester I-Premium 6MT

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#3393345 - 06/09/14 07:18 PM Re: 40AMP + Charger/Power Supply [Re: Ndx]
heynow Offline


Registered: 05/09/05
Posts: 354
Loc: Nevada
I'm guessing that the ECU mfg wants you to have a stable voltage in a worst case scenario (doors open and interior lights drawing power, ignition on, headlights on, etc.), especially since some programs can take a while to load.
_________________________
1991 Acura NSX
1991 Suzuki Samurai
2005 BMW r1200GS

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#3393385 - 06/09/14 08:00 PM Re: 40AMP + Charger/Power Supply [Re: Ndx]
Ndx Offline


Registered: 04/04/08
Posts: 1773
Loc: IL
Actually I just went back it says 70AMP power supply or battery charger

YES 70

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#3393403 - 06/09/14 08:14 PM Re: 40AMP + Charger/Power Supply [Re: Ndx]
Eddie Offline


Registered: 12/07/03
Posts: 8256
Loc: Florida, Cape Coral
Capable of handeling a 70 AMP load but, will probaaly only use 5 AMPs unless someone turns on head lights or the fans start running.
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#3393410 - 06/09/14 08:23 PM Re: 40AMP + Charger/Power Supply [Re: Ndx]
Ndx Offline


Registered: 04/04/08
Posts: 1773
Loc: IL
Hello Eddie,

That's the problem during programming a lot elements might be cycled etc ...

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#3393457 - 06/09/14 09:01 PM Re: 40AMP + Charger/Power Supply [Re: Ndx]
JimPghPA Online   content


Registered: 08/22/09
Posts: 3191
Loc: Pittsburgh,PA U.S.A.
Originally Posted By: Ndx
Hello Eddie,

That's the problem during programming a lot elements might be cycled etc ...


Most cigarette lighter sockets in vehicles are fused at 15 Amps, and fuses work the same regardless of the direction of current flow. The fuse does not know if the current is flowing (TO whatever is plugged into the socket), or if current is flowing (FROM a charger plugged into the socket) in either case if you exceed the current rating of the fuse, the fuse will blow, fuses are by directional but will blow at the same amount of current regardless of the direction of flow. So look at the fuse for the cigarette and if you are going to plug a charger into that circuit the fuse value in Amps is the largest amount of current your charger will ever be able to supply to the vehicle from the charger plugged into the lighter socket.

Now if you were connecting the charger to the battery connections of the vehicle then you could use a charger with a higher current capacity.
_________________________
Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa


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#3393502 - 06/09/14 09:42 PM Re: 40AMP + Charger/Power Supply [Re: Ndx]
901Memphis Offline


Registered: 08/14/10
Posts: 10953
Loc: Northern Kentucky
I don't see any automatic chargers in that range. You don't want a 70 amp manual current going to a full battery and you don't want to do anything to the ecu without your battery full. I suggest you see what others are using for this specific application.

If you want one of the best chargers on the market with advanced Micro processor I would look at a Noco Genius. They make a very nice 26 amp charger but it's over $200.

http://www.geniuschargers.com/G26000
_________________________
2002 Buick Century 125k - Built 4T65e(Maxlife) - Syn Frankenbrew + XG 3387A
1998 Nissan Altima 335k - 5MT - M1 HM 5w30/Fram Ultra XG7317+MOS+ATP 205

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#3393510 - 06/09/14 09:50 PM Re: 40AMP + Charger/Power Supply [Re: Ndx]
Rand Offline


Registered: 08/20/03
Posts: 10562
Loc: NE,Ohio
_________________________
2015 Forester I-Premium 6MT

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