Reversed battery connection
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2nd Gear
Joined: Apr 2023
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Reversed battery connection
So this is completely off topic and I just joined so I’m not sure where I go to ask questions maybe your or someone that sees this can help possibly? I’d appreciate it tons If so! So my son put a new battery of of one the other vehicles into our 2000 expedition in reverse. I tried to rectify and set it properly, but the terminals are sparking in the correct position. Also, the alternators smoked some battery is good cables are good checked with multimeter. Any advice would be great. Thanks guys.
Lead Driver
Joined: Apr 2007
Posts: 5,958
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From: Houston
So this is completely off topic and I just joined so I’m not sure where I go to ask questions maybe your or someone that sees this can help possibly? I’d appreciate it tons If so! So my son put a new battery of of one the other vehicles into our 2000 expedition in reverse. I tried to rectify and set it properly, but the terminals are sparking in the correct position. Also, the alternators smoked some battery is good cables are good checked with multimeter. Any advice would be great. Thanks guys.
FTE Legend
Joined: Nov 2015
Posts: 30,915
Likes: 4,123
From: Angier, NC
So this is completely off topic and I just joined so I’m not sure where I go to ask questions maybe your or someone that sees this can help possibly? I’d appreciate it tons If so! So my son put a new battery of of one the other vehicles into our 2000 expedition in reverse. I tried to rectify and set it properly, but the terminals are sparking in the correct position. Also, the alternators smoked some battery is good cables are good checked with multimeter. Any advice would be great. Thanks guys.
Also best to start your own thread and not tag on to others as information can get all mixed up between the OP and yours.
But as a hint if the magic smoke was let out of the alternator then that could be why the cables spark when hooked up but more testing would be needed to make sure.
Dave ----
Lead Driver
Joined: Nov 2020
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From: Sportsman's Paradise
Disconnect the large wire on the starter and the alternator. Try connecting the battery cables again and see if the sparking occurs, if it doesn't (which I suspect it won't) touch the large wire back on the alternator or starter and see if either sparks, if it sparks note which component it does and replace it.
Repeat for the other component if sparks result when connecting it's large wire.
Repeat for the other component if sparks result when connecting it's large wire.
FTE Community Team
Joined: Jan 2019
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Small spark for a fraction of a second is probably a good sign. Like the size of the tip of a pen, and not loud. If this is all it is, then leave it connected and make sure it doesn't get warm in the next few seconds, then see if it starts etc.
Large sparks are bad, like big and loud and maybe with a buzzing sound accompanying it. if it connects like this, the terminal will probably get hot in the next few seconds after it is connected.
If connecting it causes smoke anywhere, then disconnect and consider having a professional look at it, or prepare to start some major electrical troubleshooting if you know how to work on cars.
Welcome aboard!
Large sparks are bad, like big and loud and maybe with a buzzing sound accompanying it. if it connects like this, the terminal will probably get hot in the next few seconds after it is connected.
If connecting it causes smoke anywhere, then disconnect and consider having a professional look at it, or prepare to start some major electrical troubleshooting if you know how to work on cars.
Welcome aboard!
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