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Re: Voltage drain needs investigation [Re: Lugnutz] #1329362 Wed Oct 09 2019 06:34 PM
Joined: Sep 2011
Posts: 1,830
L
Lugnutz Offline OP
Shop Shark
So it seems that everyone is of the opinion that 1.03 mA is no big deal. I will try to figure out where it’s coming from none the less. As far as why the horn began to blow on its own, I suspect that it was something in the steering column after all. Now that the steering column has been removed from the truck, the horn does not blow.
I’m assuming that 10.5 V would be enough to trigger the relay if there was a problem.

Last edited by Lugnutz; Sun Oct 13 2019 11:25 PM.
Re: Voltage drain needs investigation [Re: Lugnutz] #1329365 Wed Oct 09 2019 07:59 PM
Joined: Sep 2011
Posts: 1,830
L
Lugnutz Offline OP
Shop Shark
Laugh at me if you want, but here is what I think happened the day my horn started blowing all by itself.
1. Something in my steering column caused a ground connection to the brown wire that goes to the horn relay.
2. I unplugged the wire to the horn but the relay was still activated by the ground.
3. The still activated relay drained my battery.
4. Once the battery was dead, the relay disconnected internally.
5. Since removing the steering column from the truck, the ground to the horn relay has been eliminated.
6. I’ve discovered an incidental 1 mA drain on the battery that has nothing to do with the original horn problem.
7. I need a new battery. My battery must have been on its last leg because even after charging, it’s still not able to deliver 12V.

Re: Voltage drain needs investigation [Re: Lugnutz] #1329366 Wed Oct 09 2019 08:21 PM
Joined: May 2015
Posts: 1,520
K
klhansen Online
Shop Shark
Sounds plausible. Relays will often engage, and the load draws the voltage down, causing the relay to drop out, and the battery recovers allowing the relay to re-engage,causing the voltage to drop, etc. etc. That's the reason you get the "click-click-click" on a starter relay with a low battery.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos
Re: Voltage drain needs investigation [Re: Lugnutz] #1329373 Wed Oct 09 2019 09:42 PM
Joined: May 2005
Posts: 6,333
B
bartamos Offline
Master Gabster
Not laughing at all. This is troubleshooting 101, DIY style. It's very easy to misdiagnose and chase your trail. I've done it many times and am trying to get smarter. Thanks for keeping us updated, This is how we all learn together. Many good ideas and suggestions on this post with you doing all the hard work. Hope the new battery and rebuilt/rewired column gives good results.

Tests you need to do in the future with new battery.
1. Test battery at rest. Test across the posts and get 12.6V or close. Battery good.
2. Test battery, motor running. Test across post, and then across post clamps, to get 14V or close. Alternator good.


I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.


Re: Voltage drain needs investigation [Re: Lugnutz] #1329394 Thu Oct 10 2019 12:28 AM
Joined: Mar 2010
Posts: 8,552
5
52Carl Offline
Master Gabster
Good find Lugzy! I was getting ready to post that "I told you so," but I never made a post at all until this one smile

Re: Voltage drain needs investigation [Re: Lugnutz] #1329415 Thu Oct 10 2019 02:43 AM
Joined: Mar 2019
Posts: 114
S
Shakey61 Offline
Shop Shark
Good job!

-Kevin


This is what happens when you live with a house-full of women, the wife and daughters name all the cars:
1960 Impala - "Frankie" (Frank Sinatra)
1961 Apache - " 'Mater Jr." (wrecker)
1972 SuperBeetle Convertible - "Juliet"
1976 SuperBeetle Convertible - "Olaf"
1988 Alfa Romeo Spider Veloce - "Romeo"
Re: Voltage drain needs investigation [Re: Lugnutz] #1330502 Sun Oct 20 2019 01:46 AM
Joined: Nov 2018
Posts: 13
J
Joe W Offline
New Guy
My battery drains 2mA...as the alternator shows a resistance of 5.8k... Im not sure if that is standard...either way,..something else to investigate.

Re: Voltage drain needs investigation [Re: Lugnutz] #1330602 Mon Oct 21 2019 01:18 AM
Joined: Mar 2019
Posts: 114
S
Shakey61 Offline
Shop Shark
A single garden-variety LED draws 20mA when lit. Unless your meter can read down to μA, 1 or 2 mA is a rounding error, and of no concern. My cigarette-lighter USB charger has a blue LED for backlighting, so there's 20mA even when nothing is plugged into it.

-Kevin


This is what happens when you live with a house-full of women, the wife and daughters name all the cars:
1960 Impala - "Frankie" (Frank Sinatra)
1961 Apache - " 'Mater Jr." (wrecker)
1972 SuperBeetle Convertible - "Juliet"
1976 SuperBeetle Convertible - "Olaf"
1988 Alfa Romeo Spider Veloce - "Romeo"
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