Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #16  
Old 12-23-2005, 05:09 PM
BusyBenz
Guest
 
Posts: n/a
I always wanted to FIX a trans-miss-ion
Reply With Quote
  #17  
Old 12-23-2005, 05:13 PM
Diesel Giant's Avatar
Registered User
 
Join Date: Oct 2004
Location: Loganville/Atlanta
Posts: 2,156
You check car stuff with DV volts not AC. The ~ is for AC the = is for DC. DONT try it on the Ohms setting or you will smoke your meter.
__________________
1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair
Reply With Quote
  #18  
Old 12-23-2005, 05:15 PM
TheDon's Avatar
Open Discussion Moderator
 
Join Date: Oct 2005
Posts: 13,208
ok... ill try that


but ive always wanted to see a volt meter melt down
Reply With Quote
  #19  
Old 12-23-2005, 05:20 PM
BusyBenz
Guest
 
Posts: n/a
Quote:
Originally Posted by TheDon
ok... ill try that


but ive always wanted to see a volt meter melt down
Good sense of humor! Hope your driving skills are as well thought out! Kidding
Reply With Quote
  #20  
Old 12-23-2005, 05:36 PM
TheDon's Avatar
Open Discussion Moderator
 
Join Date: Oct 2005
Posts: 13,208
ive played those racing games on the ps2 and xbox with the steering wheel and the ones where i can venture in a city sometimes when im bored ill obey the rules of the road
Reply With Quote
  #21  
Old 12-23-2005, 07:07 PM
Registered User
 
Join Date: Jan 2000
Location: PA
Posts: 5,440
TheDon,

"I put a voltmeter to it" does that mean you measured the voltage of your battery?

"my neighbor was like try my 300Amp jump box" does that mean you neighbor wants you to try connecting his battery charger to start your car?

Maybe before you take the engineering and auto-tech courses, you should take a course in English composition. If you would reply in correct English, I might know what you are talking about.

The problem with the voltmeter isn't the voltmeter, its operator problems. I'd trust the voltmeter much more than the operator.

The way you test a battery with a voltmeter is to charge the battery, connect the voltmeter across the battery posts and put a load on the battery that draws 400 or more amps. You could use the car starter to load the battery. If the battery voltage drops to almost nothing, the battery is NG. Dropping a few volts is normal and that battery is probably OK.

Testing the battery voltage with the engine running and not running is a test of the charging system, not the battery.

P E H
Reply With Quote
  #22  
Old 12-24-2005, 11:24 AM
TheDon's Avatar
Open Discussion Moderator
 
Join Date: Oct 2005
Posts: 13,208
sorry if my english is not to par. I shal work on it my good man. But i did let it sit with the jump box/charger box for an hour and when i would go to crank it would be a slow sluggish crank.. just go errr uhh uhh to yourself and that is what it sounded like. i was trying to get the car started so i could mesure the charge with a load on the battery . i did get a read out of 11.8 on the battery's terminals with the volt meter. but i think i was doing something wrong. apparently the jump box has a guage on it that tells the batterys charge and it was on low. i do belive this battery is at least 3 years old. so i guess ill get a new one and test the charging system
Reply With Quote
  #23  
Old 12-24-2005, 11:39 AM
84300DT's Avatar
Senior Member
 
Join Date: Jan 2002
Location: Mass.
Posts: 2,218
Thumbs up

Quote:
Originally Posted by TheDon
i do belive this battery is at least 3 years old. so i guess ill get a new one and test the charging system
sounds like a good plan...
you can get one at AutoZone...or maybe even WalMart.

__________________
1984 300D Turbo - 231k....totalled 11/30/07 RIP
Reply With Quote
  #24  
Old 12-24-2005, 01:12 PM
whunter's Avatar
Moderator
 
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,353
You must have at least a 100 AMP battery charger

Quote:
Originally Posted by TheDon
sorry if my English is not to par. I Shall work on it my good man. But i did let it sit with the jump box/charger box for an hour and when i would go to crank it would be a slow sluggish crank.. just go errr uhh uhh to yourself and that is what it sounded like. i was trying to get the car started so i could measure the charge with a load on the battery . i did get a read out of 11.8 on the battery's terminals with the volt meter. but i think i was doing something wrong. apparently the jump box has a guage on it that tells the battery charge and it was on low. i do believe this battery is at least 3 years old. so i guess ill get a new one and test the charging system
You must have at least a 100 AMP battery charger, to recharge your battery in hours, not days.
http://www.harborfreight.com/cpi/ctaf/Category.taf?CategoryID=444&pricetype=
Reply With Quote
  #25  
Old 12-24-2005, 01:15 PM
Registered User
 
Join Date: Jan 2000
Location: PA
Posts: 5,440
The Don,

I would test the charging system first and get it working properly before buying a new battery. Even a new battery will not start the engine all the time if the alternator isn't recharging it.

As far as the slow cranking, That could be caused by a bad connection in any of the connections of the battery cables or the battery terminals. Put your volt meter accross the connections. Any reading above 1/2 volt is a problem. You can also do feel check trying to find a hot spot. Be careful you don't burn yourself. I did one time but at least I found out why my old Chevy wouldn't crank very fast.

11.8 volts sounds about right for a battery that isn't fully charged. Fully charge the battery and it should read about 12.5 volts.

I asked at Walmart and although a group 49 was in the catalog, they don't stock them. So AutoZone (AZ) is the place to buy a new battery. AZ usually has a group 49 on the shelf. The AZ group 49 battery isn't their best battery, but it still has 1000CA and 875CCA. Last price I saw recently was $65.

P E H

PS: It is proper to start a new sentence with a capital letter.
Reply With Quote
  #26  
Old 12-24-2005, 01:17 PM
TheDon's Avatar
Open Discussion Moderator
 
Join Date: Oct 2005
Posts: 13,208
Like this ? My car would always start with a strong crank I just dont know why it did this yesturday. All i did was drive it around the block and go park in my driveway. Ill get the voltmeter and check the ground connections. Ill also get a jump from my friend with an old MR2 and test the charging system too
Reply With Quote
  #27  
Old 12-24-2005, 01:21 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by whunter
You must have at least a 100 AMP battery charger, to recharge your battery in hours, not days.
http://www.harborfreight.com/cpi/ctaf/Category.taf?CategoryID=444&pricetype=

Roy, just a point of note,

I've owned a tiny 6 amp Sears charger all my life and it has always provided a full charge to a battery when left overnight. It starts out at 6 amps and slowly drops to below 1 amp as the voltage in the battery rises.

No good for starting an engine, but, has always done the job if allowed to work for 12 hours or so.
Reply With Quote
  #28  
Old 12-24-2005, 01:31 PM
Registered User
 
Join Date: Jan 2000
Location: PA
Posts: 5,440
TheDon,

Not only check the ground connections but the + side connections too. Like where the battery cable connects to the solonoid or where the other terminal of the solonoid connects to the starter. That was the hot spot on the Chevy I was talking about.

I agree with Brian about a small current battery charger. I built a battery charger 40+ years ago that has a maximum current of 8 amperes. And that charger has always charged a battery overnight.

P E H
Reply With Quote
  #29  
Old 12-24-2005, 01:57 PM
whunter's Avatar
Moderator
 
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,353
A good battery = 12 - 24 hours minimum time.

A good battery with a low AMP charger = 12 - 24 hours minimum time.
Not good if you are in a hurry.
A marginal/bad battery with a low AMP charger = 24 too infinite hours.
I use this for work = time is money = 100 AMP for half to one hour, and it is charged.

Please consider; there are times when a fast boost/charge is needed.
* Single vehicle = no alternative transport.
* Extreme cold weather starting.
* Marginal/bad starter.
* Prolonged diagnostic work draining battery.
* Just plain nice to have, when you need it.

Low AMP chargers are nice for maintenance charging a good battery.

Edit: thank you P E H

Last edited by whunter; 12-25-2005 at 12:10 AM.
Reply With Quote
  #30  
Old 12-24-2005, 08:13 PM
TwitchKitty's Avatar
Just fix it
 
Join Date: May 2004
Location: Varies
Posts: 3,321
Quote:
Originally Posted by P.E.Haiges

The problem with the voltmeter isn't the voltmeter, its operator problems. I'd trust the voltmeter much more than the operator.

The way you test a battery with a voltmeter is to charge the battery, connect the voltmeter across the battery posts and put a load on the battery that draws 400 or more amps. You could use the car starter to load the battery. If the battery voltage drops to almost nothing, the battery is NG. Dropping a few volts is normal and that battery is probably OK.

Testing the battery voltage with the engine running and not running is a test of the charging system, not the battery.

P E H
The info you need is in the quote above.

The roadside test is to start the car with the headlights on. See if the headlights dim while cranking. Your are in effect using the headlights as a voltmeter. Try with a known problem-free car for comparison and verification.

Bad connections, with high resistance, get hot under a load.

Merry Christmas, or if that pisses you off, Happy Holidays.
__________________
And that's the way it is. Sorry if this is not what you wanted to hear. I reserve the right to be wrong, others take the liberty. My posts are not intended to be complete, just enough to help you find your own answers. Don't let the Relevance Paradox get you.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 02:51 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page