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05-04-2023, 08:33 PM | #41 |
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Join Date: Sep 2018
Location: Pleasant Hill, CA
Posts: 6
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Re: Parasitic Drain?
I’d agree with you all. This was my dad’s and he made some changes so I am running with his past decisions. Crossing my fingers and hoping a new alternator will solve my headaches.
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12-04-2023, 09:44 AM | #42 |
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Join Date: May 2010
Location: Long Island, NY
Posts: 3,498
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Re: Parasitic Drain?
A battery cutoff switch will solve the problem.
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12-04-2023, 04:58 PM | #43 |
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Join Date: May 2010
Posts: 2,606
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Re: Parasitic Drain?
Dash light #63 lamp .63 amps
I see that this an old thread ... I wonder what fixed it? Last edited by Benson; 12-04-2023 at 07:05 PM. |
12-04-2023, 05:22 PM | #44 |
Senior Member
Join Date: Nov 2010
Location: Sebastian, FL
Posts: 479
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Re: Parasitic Drain?
I think everyone has this problem. I bought a cut out switch from NAPA and installed it just under the fire wall on the positive battery cable. When I shut the A down I turn that switch off and now there is NO juice flowing in the car while it is parked in the garage. Works like a charm. Never have a battery issue.
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12-04-2023, 06:15 PM | #45 |
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Join Date: May 2010
Location: on the Littlefield
Posts: 6,167
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Re: Parasitic Drain?
Stock cars with generator don’t have the parasitic drain, I can let my car sit 6-8 months, no maintainer charging in between and I expect it to start,
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12-04-2023, 07:45 PM | #46 |
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Join Date: May 2010
Location: St Charles , Missouri
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Re: Parasitic Drain?
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Easy to find issues if you know how to use your voltmeter. I have given Marc seminars several times entitled “ voltmeter “ best tool in your toolbox. I had a Full house both times…. I know this is an old thread but I always enjoyed Tom Wesenberg’s Model A friendship and wisdom and it’s great to read his comments still. Larry Shepard |
12-05-2023, 10:50 AM | #47 |
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Join Date: Jun 2015
Location: Red Deer, Alberta
Posts: 5,060
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Re: Parasitic Drain?
Multimeter
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12-05-2023, 03:06 PM | #48 | |
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Join Date: May 2010
Posts: 2,606
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Re: Parasitic Drain?
Yes Larry,
As soon as I saw that the drain was around 0.6 amps a light went off in my head for me. I looked up the current draw on the #63 light bulb which is why my post reads #63 lamp .63 amps. Yes, Tom was an old time Army trained Tech as I remember. I think that he repaired "Deuce and a Half's" at Ft Bliss, TX about the time that I was there. Last week the new battery on the 1988 Cressida went dead. A VOM showed .95 amps drain after battery was charged ... The switch on the Map Light above the driver's seat was on. This car sits for weeks at a time sometimes without being driven. Quote:
Last edited by Benson; 12-08-2023 at 01:38 PM. |
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12-06-2023, 10:16 AM | #49 |
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Join Date: Mar 2020
Posts: 150
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Re: Parasitic Drain?
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12-06-2023, 11:48 AM | #50 |
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Join Date: Jul 2011
Location: Redondo Beach, CA
Posts: 5,857
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Re: Parasitic Drain?
Considering a 10si alternator has 6 diodes in the rectifier, there is no doubt it will have a small amount of leakage.
Last edited by Y-Blockhead; 12-06-2023 at 12:03 PM. |
12-06-2023, 02:36 PM | #51 |
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Join Date: May 2010
Location: Southern Maine
Posts: 1,502
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Re: Parasitic Drain?
Back in the dark ages it was common to use a test light, disconnect the battery cable and hook the light between the battery post and the cable, if the light comes on you have a draw that is excessive, if the light does not come on you are OK in draw department. Of course the first step when using a test light is to be sure it works.
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12-06-2023, 08:58 PM | #52 |
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Join Date: Jun 2017
Location: Walla Walla, WA
Posts: 1,047
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Re: Parasitic Drain?
The Nu-Rex alternator I have is basically a 10si, but probably made in China or somewhere else. It's parasitic draw is so slight, I have left the car with the shut-off switch on for weeks and not had a problem. I usually turn it off when parked overnight, but I have been known to forget, just like everyone else. The main reason I have for shutting it down is just because you never know when a diode is going to fail. That being said, I never bother shutting off the shut-off switch if I am just parking for short times.
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12-09-2023, 01:50 PM | #53 |
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Location: Anchorage, Alaska
Posts: 9,117
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Re: Parasitic Drain?
I always use a battery maintainer if it is going to sit idle for more than a couple of weeks. Has helped my 2-year battery last 12 years and going.
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12-09-2023, 02:18 PM | #54 |
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Re: Parasitic Drain?
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