Battery maintainer problems - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 24 (permalink) Old 11-10-2018, 08:13 AM Thread Starter
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Battery maintainer problems

Thought i would instal a battery maintainer onto the 66 galaxie 288. So the way i went about it was as such. Maintainer has a red and black which i went directly to the battery with. The other end has a normal 110 end to go to house hold current. I plugged the 110 end into a 12" multi female end cord. Then also plugged in the block heater to the same female end of this cord. So at this point i have both the tender and block heater together on one cord.from here it gets plugged into an extension cord and to house hold current. Both work fine at this point. After this it gets wonky. I unplug the extension cord and leave the short multi block cord plugged into both the block heater and the battery maintainer. I drive away. Half hour later i turn off the car. The battery now acts as if it is compltely dead. I unhook the two units from the short block cord and all is well . I have battery power once again. Question .. was the battery trying to back feed power to the block heater . Both being plugged into the multi port cord . Or maybe just shorting out. Thanks
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post #2 of 24 (permalink) Old 11-10-2018, 08:37 AM
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Re: Battery maintainer problems

you have to disconnect the block heater
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post #3 of 24 (permalink) Old 11-10-2018, 09:04 AM Thread Starter
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Ok so can i charge both with the same cord at the same time
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post #4 of 24 (permalink) Old 11-10-2018, 09:28 AM Thread Starter
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The way i see it. I can run both units with one cord. But if the house hold power goes out while plugged in i would be back to the same problem. Opinions? Thanks
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post #5 of 24 (permalink) Old 11-10-2018, 04:46 PM
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Re: Battery maintainer problems

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Originally Posted by Oakboy View Post
Thought i would instal a battery maintainer onto the 66 galaxie 288. So the way i went about it was as such. Maintainer has a red and black which i went directly to the battery with. The other end has a normal 110 end to go to house hold current. I plugged the 110 end into a 12" multi female end cord. Then also plugged in the block heater to the same female end of this cord. So at this point i have both the tender and block heater together on one cord.from here it gets plugged into an extension cord and to house hold current. Both work fine at this point. After this it gets wonky. I unplug the extension cord and leave the short multi block cord plugged into both the block heater and the battery maintainer. I drive away. Half hour later i turn off the car. The battery now acts as if it is compltely dead. I unhook the two units from the short block cord and all is well . I have battery power once again. Question .. was the battery trying to back feed power to the block heater . Both being plugged into the multi port cord . Or maybe just shorting out. Thanks
Hi there,

Why on earth would you leave both plugged in? If you know that this creates a problem then unplug both and leave them home.

Mel
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post #6 of 24 (permalink) Old 11-10-2018, 11:46 PM Thread Starter
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Re: Battery maintainer problems

A bit of confusion here. Once I found it caused a problem .i unhooked the charger. I would like to hook them together just while plugged into the wall. Not while driving I learnt my lesson. Next I took the system off. Car just died again with none of the above hooked up. If I wait a half hour I get power again. When I click the key ahead I get 8 volts . I can start it and it will read 13 volts while running. I will start by testing and more than likely replacing the battery. Thanks
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post #7 of 24 (permalink) Old 11-12-2018, 12:30 AM Thread Starter
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Re: Battery maintainer problems

Update battery tender not the problem. Iím testing a ground when I put a test light between the pos cable and the pos battery terminal. Now what? Thanks I guess I start pulling fuses and unhooking alt...
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post #8 of 24 (permalink) Old 11-12-2018, 07:01 AM
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Re: Battery maintainer problems

make sure no dome light , glove box light, etc.
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post #9 of 24 (permalink) Old 11-12-2018, 09:17 AM
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Re: Battery maintainer problems

I would not want to run the block heater all the time I was running the battery maintainer. A battery maintainer is intended to keep a battery charge up during extended periods of non-use, while a block heater is intended to reduce the drag of very cold oil on the rotating parts of the engine, allowing the engine to start easier in frigid temperatures. Even at -40C (F) I only run the block heater for a few hours before starting, while a battery maintainer would run 24/7. There is no need to waste electricity running a block heater more than necessary.

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post #10 of 24 (permalink) Old 11-12-2018, 10:40 AM Thread Starter
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Re: Battery maintainer problems

Thanks for the advice all. I get the block heater and maintainer use. Iím also from sask. so I under stand the -40 . That being said I donít follow the dome light being on causing the test light to lite up. While hooked between the bat post and bat cable on either the + or - cables. Is this not saying I have a + charge on my neg cable and the opposite for my pos cable. Why would any light or other component turned on test as a neg on my pos cable ? Thanks
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post #11 of 24 (permalink) Old 11-12-2018, 01:38 PM
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Re: Battery maintainer problems

you aren't testing for pos or neg, simply current flow. if the dome light is on, there is a current path through it so your light lights up. if there is no current flowing the battery isn't being drained,and the test light will be off
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post #12 of 24 (permalink) Old 11-12-2018, 03:46 PM Thread Starter
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Ok so if i'm testing for current flow and not a negative. Where is the test light getting it's neg from which it needs for a ground so as to turn on it's light. Not trying to argue just to understand . Thanks so very much for the help.
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post #13 of 24 (permalink) Old 11-12-2018, 04:39 PM
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Re: Battery maintainer problems

so a circuit isa path for current to flow from one post on the battery to the other. when your test light is in that circuit anywhere, current flows and the bulb lights up . if you connect it between the neg cable and the neg post(cable disconnected), it will light if current is flowing
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post #14 of 24 (permalink) Old 11-13-2018, 05:33 AM Thread Starter
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Re: Battery maintainer problems

Yes but as I see it . And I do agree with you. The test light only lites up if the + at some point in the circuit meets a - . Such as a + line to a light bulb through the filament and exits on the - back to the - battery post. This completes the circuit of + to - back to the opposite battery post from which it came . Thus completing a circle or circuit. Really when you run a light bulb all you are doing is arching a + to a - it just so happens to have a filament in between. You could do the same by touching the + battery post to the frame of the car. If you had enough power it would also glow like a light bulb. So yes I agree with you when said that the test light is testing current flow. It is the + that finds the - at which point letís off an arch . Which can be a glowing light bulb or even an arch to the frame. Either way the test light will lite because once it finds the neg it can then flow back to the battery from which it came completing the circuit. As I see it an auto light bulb and an arc welder are essentially identical. The only difference is how much power you are willing to feed it and size of the filament. So ya my test light is testing a neg as I see it . So either I have a light on somewhere or an arch to frame or neg wire or an arch inside the alt . And thatís my long winded 2 cents. Feel free to comment or disagree . If I keep digging I may even get this thing figured out. Thanks
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post #15 of 24 (permalink) Old 11-13-2018, 07:49 AM
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Re: Battery maintainer problems

you are correct, except current flows from neg to pos.
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