 750mV from battery to ground, Tracing the short: any usual suspects? |
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| Prospectfarms |
 Mar 27 2012, 06:32 AM
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Member  Group: Members Posts: 495 Joined: 7-March 11 From: Louisville, KY Member No.: 12,801 Region Association: Upper MidWest  |
Key off. Red terminal to body gives somewhere between 1V and 750mV. (IMG:style_emoticons/default/sad.gif) To me that seems like a bare wire short to ground but I'm not an expert.
Likely spots? Anyplace I could test first before tracing the whole electrical system? How about a short (N.P.I.) list of always-hot wires in the car. Doesn't have to be comprehensive -- just looking for a starting point. Thanks. |
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| underthetire |
Mar 27 2012, 11:36 AM
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
To check ghost drains
Remove red wire from battery with key off Make sure doors are closed, lights off, etc. Place one meter lead on battery, the other on red wire Place meter leads in meter to measure amps Put meter in amp measuring range. 50MA or so would be normal for back up on stereo etc., possible more if you have an amp. |
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| Prospectfarms |
Mar 27 2012, 08:57 PM
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Member Group: Members Posts: 495 Joined: 7-March 11 From: Louisville, KY Member No.: 12,801 Region Association: Upper MidWest |
QUOTE(underthetire @ Mar 27 2012, 01:36 PM)  To check ghost drains Remove red wire from battery with key off Make sure doors are closed, lights off, etc. Place one meter lead on battery, the other on red wire Place meter leads in meter to measure amps Put meter in amp measuring range. 50MA or so would be normal for back up on stereo etc., possible more if you have an amp. I used to have a decent mulitmeter that did that, now I only have junk VAC/VDC/Ohms, etc. May get another good one to perform your test. Thanks. |
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Posts in this topic
Prospectfarms 750mV from battery to ground Mar 27 2012, 06:32 AM
stugray What?
Does the car run?
You should have ~12-13 Vo... Mar 27 2012, 08:25 AM
Prospectfarms
What?
Does the car run?
You should have ~12-13 V... Mar 27 2012, 08:49 PM ape914
What?
Does the car run?
You should have ~12-13 ... Mar 27 2012, 09:28 PM Valy
What?
Does the car run?
You should have ~12-13 ... Mar 27 2012, 09:36 PM Prospectfarms
[quote name='Prospectfarms' post='1655151' date='... Mar 27 2012, 09:51 PM Valy 1St, your battery is dead.
Disconnect it and measu... Mar 27 2012, 10:36 AM Prospectfarms
1St, your battery is dead.
Disconnect it and meas... Mar 27 2012, 08:53 PM Spoke Here's some basic voltages to check.
1) Measu... Mar 27 2012, 01:01 PM Prospectfarms
Here's some basic voltages to check.
1) Meas... Mar 27 2012, 08:59 PM Prospectfarms If I understand what your saying, if there was onl... Mar 27 2012, 09:40 PM kg6dxn The voltage you are reading could be capacitance f... Mar 27 2012, 10:00 PM Prospectfarms
The voltage you are reading could be capacitance ... Mar 27 2012, 10:32 PM rhodyguy try taking the inline fuse for the stereo out and ... Mar 28 2012, 11:18 AM kg6dxn You want to measure amperage. You want to see less... Mar 28 2012, 05:18 PM Prospectfarms Dugout my real mulitmeter. Replaced fuse and batte... Mar 28 2012, 07:26 PM Valy You are good although 25mA for the stereo is a bit... Mar 28 2012, 08:32 PM Prospectfarms
You are good although 25mA for the stereo is a bi... Mar 29 2012, 05:48 AM Valy What else is always on? Clock? Mar 29 2012, 08:43 AM warrenoliver
What else is always on? Clock?
when I had batt... Mar 29 2012, 11:20 AM Prospectfarms Sorry for the delay responding. Unfortunately I do... Mar 29 2012, 10:36 PM kg6dxn Your drain seems a little high with no radio or cl... Mar 29 2012, 10:47 PM Prospectfarms
Your drain seems a little high with no radio or c... Mar 30 2012, 09:34 PM |
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