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Old 04-22-2019, 06:24 PM   #1
jfnar
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Join Date: Jul 2009
Location: Jonesboro, AR
Posts: 356
10SI alternator battery drain

My battery started dying when the truck sat for a couple days. I started looking for a short and found that the #2 terminal was drawing current when not running. A test light will come on when I disconnect that wire and put the light between the wire and terminal. I had another alternator in my junk collection so I swapped it out and it's doing the same. Is there something other than the alternator that could be causing this? Any help will be much appreciated. Thanks.

Jeff
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Old 04-23-2019, 02:08 PM   #2
vince1
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Location: Calgary Alberta
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Re: 10SI alternator battery drain

Your problem is of interest to me as well. It takes more than a month for my battery to run down so if not in use I usually take the ground cable off. I always thought that maybe it was the new radio I put in that is drawing current and some day maybe I'll have time to figure it out. Hopefully someone will have an answer for you.
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Old 04-25-2019, 08:46 AM   #3
vince1
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Re: 10SI alternator battery drain

What about if you disconnect the alternator wires and put your test light between your battery terminal and cable?
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Old 04-25-2019, 08:53 AM   #4
jfnar
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Location: Jonesboro, AR
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Re: 10SI alternator battery drain

Still lights up if everything else is disconnected. I took it to a napa store and they told me it probably has a bad diode so I traded in on one of their reman alternators. Checked it when I got home and it does the same thing. Maybe it's supposed to do that. I don't know how much amperage any of them are leaking; test light only tells yes or no. Hopefully the new one won't kill the battery. Time will tell.
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Old 04-25-2019, 11:30 AM   #5
vince1
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Re: 10SI alternator battery drain

I have the CS130 in my 64 AMC Rambler and it can sit for months without draining the battery.

I have the 10si in my truck and will try disconnecting it to help isolate the draw. If it is the 10si, I have a junkyard spare CS130 to use.
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