06 E320 CDI

Where do I hook up a trickle charger on this particular MB diesel model?

I'll be storing my CDI for up to 6 - weeks at a time, and I don't want to unhook the batteries every time.

Part B): Is there ONE contact point that will keep BOTH CDI batteries on the one trickle charger?

Thanks for any experience / expertise with this MB diesel model with (2) batteries on-board!

It doesn't look like anyone knows!

I can't help either though there was a thread started by either shertex or Kartek (I think) a few months back about W210 batteries and how a trickle charger can cock up the electronics (possibly a post by whunter) =>

Could I be more vague?

What does the book say?

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

Well I know when the ignition key is turned off the BCM isolates both batteries. Since the auxillary battery is used for brakes only I wouldn't really worry about it loosing a charge in 6 weeks.

The SAMs are fussy as my neighbour found out after his son gave a friend a boost and blew one. I understand your concern and I would visit the dealer and ask about using a trickle charger vs a battery tender.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

Why worry about 90 days? Is there something fouled up that wont turn off?

I start my 300D once a year. I pull the neg cable, reconnect it and it fires right up.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Hmmmmm. I wouldn't be concerned with keeping up the aux battery. Once you have verified the model trickle charger you have will be safe on your vehicle, I'd just keep the main battery peaked.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

What models are ppl here using as battery tenders?

Also, will the battery tender work by pushing it in the front seating area ashtray / rear seating area, OR the trunk auxiliary DC plug-in??

I priced one out @ the MB dealer and the cost was like $200.00!

Look up on YouTube what Kent Bergsma said about battery chargers. He was recommending a Ctek Smart Charger with a reconditioning cycle, that pulsates electricity charges and knocks some of the sulfate off the batteries.

I use a Battery Tender Plus. Haven't had the occasion to use it yet on my CDI, but other CDI owners assure me it will work fine.

On a related topic....hadn't worried before about completely disconnecting power from the car. On the W210 it's simply a matter of resetting steering angle sensor and resynching windows. But there's a lot more going on in a newer car. So Bergsma recommends using an adapter than enables you to keep 12v applied to all the electronics through the OBD port when disconnecting the battery cables. Assuming that such a procedure is perfectly safe, seems like the way to go.

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Through the OBDII port? Supply power?

Only enough current to keep the ECU powered up so that it does not lose its adaptations and memory when the battery is disconnected.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

Interesting.

Trickle charger usually means a small amp, dumb charger, that might kill your battery over time. What you want is a smart battery maintainer that periodically checks your battery for charge, provides a higher charge voltage until it is charged up, and then uses a low float charge of only about 13.4 volts to maintain the full charge. I would hook it to the main battery. Not sure if the brake battery will be maintained or not, but it seems like it should.

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'97 E 300 D

I have an 1981 300SD so I have never heard of a brake battery. What the heck is it for; how does it work with the brakes? Do all cars have them now?

Excellent points, nelbur.

The 06 CDI has the SBC (Sensonic Brake Control), necessitating the 2nd auxiliary battery located in the engine compartment under the cabin HVAC, fresh air filter & intake, on the passenger side nearest the firewall.

*Q: Will the CDI's auxiliary DC plug-ins all accept and charge the main battery? There's 4 plug ins; front ashtray (1), rear seating area ashtray (2), trunk cavity (1).

As far as I know, only the SBC (SensonicBrakeControl) (Mercedes patented I think) years of Mercedes. That was short lived in years. The SBC anti-lock brake system uses the aux. battery, and the main battery as a backup. If my observation of mine going bad is accurate.

If you want to see what SBC does, there's at least one YouTube illustrating what it does, and how it is superior to anti-lock brakes. In effect, SBC is individual anti-lock brakes on each wheel.

The SBC battery is the size of and the same as a big motorcycle battery. I bought my replacement at NAPA. A Nippon/Chinese 12Volt - is just fine.

We 05 and 06 - I6 fixated MB E320 diesel buyers, will put up with the $1,500.00 +/- cost of a complete SBC system replacement, to not have to get the later W211, V6 Bluetec configuration.