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Battery Maintainer damage an alternator? #5464287 06/27/20 04:14 PM
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BMWTurboDzl Offline OP
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Is there any chance that a battery maintainer (CTEK 7002) would physically damage an alternator?


“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

435i
Re: Battery Maintainer damage an alternator? [Re: BMWTurboDzl] #5464294 06/27/20 04:23 PM
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ripcord Offline
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Alternators (functional ones anyway) have a diode that prevents current from flowing from the battery back to the alternator. Think of it as a one way valve. There should be no problem charging a battery with the cables attached. That said, you should check your owners manual to see what it says.

Re: Battery Maintainer damage an alternator? [Re: BMWTurboDzl] #5464296 06/27/20 04:27 PM
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Chris142 Offline
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No


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: Battery Maintainer damage an alternator? [Re: BMWTurboDzl] #5464304 06/27/20 04:41 PM
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Blkstanger Offline
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I use a maintainer all the time on my Jeep. Never a problem. I used to have a nice solar one I used for many years. I am looking for another one like it.


99 Jeep WJ 4.7 205,000mi. Maxlife 10w30, Fram Ultra.
15 Ford Escape S 2.5, 81,000mi. Castrol Edge 5w30 Fram Ultra.
Re: Battery Maintainer damage an alternator? [Re: BMWTurboDzl] #5464321 06/27/20 04:59 PM
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Char Baby Online Content
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I currently have one mounted atop the battery in the Firebird in my signature for the past 20 years. I've connected it permanently with a longer cord so I don't even have to pop the hood(bonnet) when I plug'er in. And I use another maintainer on the other cars in my signature quite regularly, several times a week.

Last edited by Char Baby; 06/27/20 05:01 PM.

Retired 6 yrs now & lovin' it
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: Battery Maintainer damage an alternator? [Re: BMWTurboDzl] #5464373 06/27/20 05:56 PM
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UncleDave Offline
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Originally Posted by BMWTurboDzl
Is there any chance that a battery maintainer (CTEK 7002) would physically damage an alternator?


Dont see how unless it was damaged maybe - but it would kill your battery if that were the case - and it would be a first Ive heard of.

I have thousands of cycles on mine, but Im just one guy....

UD


Uncle Dave
Cat 3126/2 MB3500/Titan/RX400H/17 Ridgeline
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Re: Battery Maintainer damage an alternator? [Re: UncleDave] #5464385 06/27/20 06:17 PM
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CR94 Offline
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Originally Posted by UncleDave
Dont see how unless it was damaged maybe - but it would kill your battery if that were the case - and it would be a first Ive heard of. ...
What if, while the charger is connected across the vehicle's battery cables, the cables somehow lose contact with a battery terminal? Then the battery can no longer act as a buffer or capacitor to protect the the vehicle electrical system from any spikes in the charger output. I assume that's probably not a problem with most chargers, but can we be certain, without checking the charger's open-circuit output with an oscilloscope?


2011 Toyota Prius now at 111K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
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Re: Battery Maintainer damage an alternator? [Re: CR94] #5464398 06/27/20 06:40 PM
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UncleDave Offline
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Originally Posted by CR94
Originally Posted by UncleDave
Dont see how unless it was damaged maybe - but it would kill your battery if that were the case - and it would be a first Ive heard of. ...
What if, while the charger is connected across the vehicle's battery cables, the cables somehow lose contact with a battery terminal? Then the battery can no longer act as a buffer or capacitor to protect the the vehicle electrical system from any spikes in the charger output. I assume that's probably not a problem with most chargers, but can we be certain, without checking the charger's open-circuit output with an oscilloscope?


Ive connected the charger directly to battery cables before engaging "alternator mode"
That subjected the alternator to whatever max output was.

Done this several times with no issue so I could pull someones batt and try to recover.

UD


Uncle Dave
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700HP V10/ 725HP BBC/ Raptor 700/ KFX450/ YZ250/Onan 8K/ Cat3011C
Re: Battery Maintainer damage an alternator? [Re: BMWTurboDzl] #5464428 06/27/20 07:48 PM
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BMWTurboDzl Offline OP
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Thanks gents. I didn't think so, but I had to ask because I was in serious trouble if it caused my alternator to crap out.

For the record on many if not all euro cars today there's a positive terminal in the engine bay and a grounding stud attached to the body. Battery is typically located in the trunk or seat. You use these connectors when jumping the car and when using a battery tender.

Last edited by BMWTurboDzl; 06/27/20 07:58 PM.

“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

435i
Re: Battery Maintainer damage an alternator? [Re: ripcord] #5464509 06/27/20 09:49 PM
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WyrTwister Offline
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Originally Posted by ripcord
Alternators (functional ones anyway) have a diode that prevents current from flowing from the battery back to the alternator. Think of it as a one way valve. There should be no problem charging a battery with the cables attached. That said, you should check your owners manual to see what it says.


Just be careful to not reverse polarity . Do not know if it will damage an alternator , but I have read it can cause havoc with the vehicle electronics .


Wyr
God bless
Re: Battery Maintainer damage an alternator? [Re: WyrTwister] #5464533 06/27/20 10:27 PM
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UncleDave Offline
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Originally Posted by WyrTwister
Originally Posted by ripcord
Alternators (functional ones anyway) have a diode that prevents current from flowing from the battery back to the alternator. Think of it as a one way valve. There should be no problem charging a battery with the cables attached. That said, you should check your owners manual to see what it says.


Just be careful to not reverse polarity . Do not know if it will damage an alternator , but I have read it can cause havoc with the vehicle electronics .



The Ctek has polarity detection.

UD


Uncle Dave
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Re: Battery Maintainer damage an alternator? [Re: BMWTurboDzl] #5464534 06/27/20 10:28 PM
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UncleDave Offline
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Originally Posted by BMWTurboDzl
Thanks gents. I didn't think so, but I had to ask because I was in serious trouble if it caused my alternator to crap out.

For the record on many if not all euro cars today there's a positive terminal in the engine bay and a grounding stud attached to the body. Battery is typically located in the trunk or seat. You use these connectors when jumping the car and when using a battery tender.


I like that about my sprinter.

My ridgeline is a pain to reach the battery.

UD

Last edited by UncleDave; 06/27/20 10:35 PM.

Uncle Dave
Cat 3126/2 MB3500/Titan/RX400H/17 Ridgeline
700HP V10/ 725HP BBC/ Raptor 700/ KFX450/ YZ250/Onan 8K/ Cat3011C
Re: Battery Maintainer damage an alternator? [Re: ripcord] #5464541 06/27/20 10:40 PM
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user52165 Offline
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Originally Posted by ripcord
Alternators (functional ones anyway) have a diode that prevents current from flowing from the battery back to the alternator. Think of it as a one way valve. There should be no problem charging a battery with the cables attached. That said, you should check your owners manual to see what it says.


Yes, but as a corollary to that an alternator with an open diode can wreck a battery. In a moment of weakness, I once bought a rebuilt alternator from AZ. My battery would discharge quickly. Took it back, got another, did the same thing, PITA to R&R. Bad diodes in both cases. Warrantied. Insisted on a NEW Denso unit for my time and trouble, they actually agreed. No problems since. 1987 Accord. Great car but soon for sale.

Last edited by user52165; 06/27/20 10:42 PM.
Re: Battery Maintainer damage an alternator? [Re: BMWTurboDzl] #5464550 06/27/20 10:58 PM
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WyrTwister Offline
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I have seen a youtube video ( Eric O. ? ) using a scope to detect increased " ripple " due to a defective diode .


Wyr
God bless
Re: Battery Maintainer damage an alternator? [Re: BMWTurboDzl] #5464585 06/28/20 12:17 AM
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Avery4 Offline
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No, the alternator has diodes to prevent the reverse flow of current. The diodes will certainly fail if subjected to a high enough voltage, but the 15V or whatever that charger could produce isn't going to do it. Since I bought a house with a garage 2 years ago, I have been plugging my car into my Battery Tender every night with no issues.

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