 Parasitic Battery Drain source found: Now what? |
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| moneysmarts |
 Apr 6 2011, 03:50 PM
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Member  Group: Members Posts: 169 Joined: 2-March 04 From: Central Massachusetts Member No.: 1,745 Region Association: None 
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Long-time- no-post!
Hi all. Just took the car out of storage from winter, looking forward to driving. My new battery keeps draining overnight. So I tapped in-line my multimeter and started pulling fuses and relays to locate the source. When I pulled the alternator wiring harness plug from the relay board, the volts/amps dropped to zero. Bingo! But now what do I do? (IMG:style_emoticons/default/confused24.gif) Do I have a bad alternator or can I diagnose further? Thanks for the help. I'd hate to have to struggle to replace that bad boy for nothing. Steve |
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| Tom |
Apr 7 2011, 12:58 PM
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Advanced Member Group: Members Posts: 2,139 Joined: 21-August 05 From: Port Orchard, WA 98367 Member No.: 4,626 Region Association: None |
I would agree with Troy's assesment also, but there could be something else going on in the alternator. The brushes wear down coating the inside with carbon dust. If your engine is an oily one, the oil vapors and carbon dust can combine to make a" resistor". If this "resistor" happens to be across one of the diodes, it can cause a drain across it and still allow the diode to assist in the charging process.
I recently had a similar problem on my Dodge truck where it was not charging properly. Took it off to inspect and the carbon brushes were almost gone and the dust was so thick and oily that it was preventing the alt from charging correctly. Just cleaned it up, blew it out, and put in new brushes and all it back to like new. http://www.ephotomotion.com/914engine/alt1.html This website ahs a detailed process on what to do for your alt. Tom |
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Posts in this topic
moneysmarts Parasitic Battery Drain source found: Now what? Apr 6 2011, 03:50 PM
r_towle how far are you from Tyngsboro? Apr 6 2011, 03:53 PM
moneysmarts
how far are you from Tyngsboro?
I'm in Leom... Apr 6 2011, 03:54 PM messix diode in the alt is blown and is energizing the fi... Apr 6 2011, 03:54 PM Root_Werks Plug the alt harnes back in and the take the volt ... Apr 6 2011, 03:54 PM r_towle unplug just the alternator at the alternator.
It m... Apr 6 2011, 03:55 PM moneysmarts
unplug just the alternator at the alternator.
It ... Apr 6 2011, 03:59 PM r_towle not easily...but yes you can.
Chelmsford Auto Ele... Apr 6 2011, 04:01 PM moneysmarts [quote name='r_towle' date='Apr 6 2011... Apr 6 2011, 04:09 PM moneysmarts I just pulled out the voltage regulator from the r... Apr 6 2011, 04:07 PM r_towle well, that might seem easier, but it wont be in th... Apr 6 2011, 04:11 PM 76-914
well, that might seem easier, but it wont be in t... Apr 6 2011, 05:22 PM SLITS The alt harness unplugs from the relay board ........ Apr 6 2011, 05:24 PM moneysmarts
The alt harness unplugs from the relay board ....... Apr 6 2011, 05:35 PM moneysmarts Rather than pulling apart the sheet metal to get a... Apr 6 2011, 06:48 PM messix
Rather than pulling apart the sheet metal to get ... Apr 6 2011, 06:51 PM moneysmarts yes the diodes are blown and it needs to be rebuil... Apr 6 2011, 07:05 PM messix
yes the diodes are blown and it needs to be rebui... Apr 6 2011, 07:15 PM moneysmarts OK
Thanks much.
I'll have to pull it out tomor... Apr 6 2011, 07:20 PM Root_Werks Troy is my hero. :worship: Apr 6 2011, 08:59 PM r_towle in my recent experience with bosch rebuilt alterna... Apr 7 2011, 01:54 PM moneysmarts Rich:
I dropped the alt. off to Brian this morning... Apr 7 2011, 02:09 PM messix
Rich:
I dropped the alt. off to Brian this mornin... Apr 7 2011, 02:18 PM moneysmarts I have no idea Troy.
When the guy called me and sa... Apr 7 2011, 02:22 PM messix
I have no idea Troy.
When the guy called me and s... Apr 7 2011, 02:33 PM r_towle troy, these guys are very good.
This is all they d... Apr 7 2011, 02:28 PM messix
troy, these guys are very good.
This is all they ... Apr 7 2011, 02:34 PM r_towle OK, can someone post a diagram of that little wiri... Apr 7 2011, 02:33 PM moneysmarts Rich:
Just to refresh what I did...
When I pulled ... Apr 7 2011, 02:34 PM r_towle
Rich:
Just to refresh what I did...
When I pulled... Apr 7 2011, 02:41 PM messix
Rich:
Just to refresh what I did...
When I pulle... Apr 7 2011, 02:53 PM moneysmarts It looks ok, but I can replace it.
Any special gau... Apr 7 2011, 04:54 PM messix
It looks ok, but I can replace it.
Any special ga... Apr 7 2011, 05:29 PM moneysmarts how are you testing for draw? where are you doing ... Apr 7 2011, 06:51 PM SLITS Backup lights ... fuse 8 or 9? .... thru the main ... Apr 7 2011, 04:57 PM messix
Backup lights ... fuse 8 or 9? .... thru the main... Apr 7 2011, 05:30 PM SLITS The question was "Where oh where does the bac... Apr 7 2011, 05:34 PM messix so when you diconnect the wire from the alt to the... Apr 7 2011, 06:56 PM moneysmarts Yup.
Quirky.
I'll put it all back together tom... Apr 7 2011, 09:09 PM Tom I''l bet them cleaning it up cured your dr... Apr 8 2011, 08:50 AM TC 914-8 :popcorn:
I'm curious what it is
Keep us pos... Apr 8 2011, 10:58 PM moneysmarts
:popcorn:
I'm curious what it is
Keep us po... Apr 9 2011, 02:34 PM moneysmarts
:popcorn:
I'm curious what it is
Keep us p... Apr 11 2011, 08:34 AM |
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