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Old 21-12-2016   #1
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installed dbattery backward

hi, fiat forum

the other day i installed my battery in the dark no work light resulting in installing it backward, left it on for 5 seconds before i realized it was was wrong when i saw a small arc at the minus terminal. I then went and bought a new battery then checked fuses and noticed fuses f84 and f08 blown so i replaced them but still no start. i may have to re check all the fuses again incase i missed something. No lights in my dash board when ignition key in. ive already figured out how to remove the stuck key with the red lever under the steering column.

if anybody can help me i would be so happy..... thank you
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Old 21-12-2016   #2
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Re: installed dbattery backward

Check EVERY fuse with a meter (if not sure) under the bonnet and inside the passenger compartment and hope you've not fried the ecu etc.
Note it should not be possible to put the wrong terminal as they are different sizes to try and prevent just this possibility.
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Last edited by John202020; 21-12-2016 at 21:30.
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Old 21-12-2016   #3
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Re: installed dbattery backward

okay thank you, and my incompetence cut the zip ties that were fastening the battery cables beacause they were too short thinking i bought a odd sized battery but it turned out i installed it backwards thats why the cables wouldnt reach the terminals.... anyways thanks for that note hehe
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Old 21-12-2016   #4
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Re: installed dbattery backward

I wouldn't think that the leads would even reach the battery if it were in backwards.

The terminals are at the rear of the battery in its correct orientation.
To turn it the other way round, the terminals would be at the front and in opposite directions, and I cannot see how the leads would reach.

Obviously they can, because you've done it.

Good luck, but I reckon you've buggered something big-time.

Best wishes,
Mick.
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Last edited by Mick F; 21-12-2016 at 22:03. Reason: Typos and stuff
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Old 21-12-2016   #5
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Re: installed dbattery backward

Don't give up hope yet, there are some safeguards for just this possibility however it may still be an expensive road, go through methodically checking each fuse with the battery disconnected, I say use a meter as it's not always obvious if it's blown some fuses are physically larger under the bonnet once you've checked all and replaced any blown if still nothing get expert diagnosis telling them what happened.
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Old 21-12-2016   #6
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Re: installed dbattery backward

Quote Originally Posted by John202020 View Post
Don't give up hope yet, there are some safeguards for just this possibility however it may still be an expensive road, go through methodically checking each fuse with the battery disconnected, I say use a meter as it's not always obvious if it's blown some fuses are physically larger under the bonnet once you've checked all and replaced any blown if still nothing get expert diagnosis telling them what happened.


Check the manual and make sure you have identified all the fuse locatations. It is worth checking the "small print" of your insurance policy, this might be covered as "accidental damage" if there is significant damage.

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Old 21-12-2016   #7
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Quote Originally Posted by g8rpi View Post


Check the manual and make sure you have identified all the fuse locatations. It is worth checking the "small print" of your insurance policy, this might be covered as "accidental damage" if there is significant damage.

Robert G8RPI.
Quite true, but there's a chance they'll write it off, in the worst case?
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Old 21-12-2016   #8
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Re: installed dbattery backward

Quote Originally Posted by Mick F View Post
I wouldn't think that the leads would even reach the battery if it were in backwards.
They won't, unless you cut the zip ties .

But hey, we've all of us done something stupid at some point when working on a car.

Condolences to the OP - I can imagine you are well gutted (or whatever the equivalent is in US english).

Question for the OP: did you turn the key before noticing that the battery was installed backwards?
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Last edited by jrkitching; 21-12-2016 at 23:01.
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Old 21-12-2016   #9
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Re: installed dbattery backward

I doubt it would be a write-off but you might need a few parts. Worst case a accident damaged car could provide the bits you need and then sell the remains like the engine and transmission.

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Old 22-12-2016   #10
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Re: installed dbattery backward

Quote Originally Posted by jrkitching View Post
They won't, unless you cut the zip ties .

But hey, we've all of us done something stupid at some point when working on a car.

Condolences to the OP - I can imagine you are well gutted (or whatever the equivalent is in US english).

Question for the OP: did you turn the key before noticing that the battery was installed backwards?
i put the clamps on the terminal, watched some sparks fly for 5 seconds then took it off hehe
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Old 22-12-2016   #11
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Re: installed dbattery backward

Quote Originally Posted by dangwk View Post
hi, fiat forum

the other day i installed my battery in the dark no work light resulting in installing it backward, left it on for 5 seconds before i realized it was was wrong when i saw a small arc at the minus terminal. I then went and bought a new battery then checked fuses and noticed fuses f84 and f08 blown so i replaced them but still no start. i may have to re check all the fuses again incase i missed something. No lights in my dash board when ignition key in. ive already figured out how to remove the stuck key with the red lever under the steering column.

if anybody can help me i would be so happy..... thank you

sorry lads.. turns out i had the yellow 20 amp fuse in the wrong slot when i replaced it... note to self: slow the fk down
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Old 22-12-2016   #12
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Re: installed dbattery backward

thank you all for the support. have a nice holiday!
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Old 22-12-2016   #13
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Re: installed dbattery backward

Quote Originally Posted by dangwk View Post
sorry lads.. turns out i had the yellow 20 amp fuse in the wrong slot when i replaced it... note to self: slow the fk down
Great news.
The electronics in a car should be able to withstand a brief reversal or even application of 24V by design. I didn't want to jinx it (or be proved wrong by the exception) by saying anything earlier. Apart from being good design it's actually a requirement of many automotive standards. One thing that helps is the alternator takes much of the current (through the rectifier and stator) during a reversed connection.


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Old 23-12-2016   #14
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Re: installed dbattery backward

Quote Originally Posted by Mick F View Post
I wouldn't think that the leads would even reach the battery if it were in backwards.
Quote Originally Posted by jrkitching View Post
They won't, unless you cut the zip ties .
I've just checked ours.

There is no way - even if you cut every single zip tie - that the leads will reach.
In fact, it's impossible, as positive leads aren't long enough. Actually WAY too short to reach anything but the rear left terminal.

If the battery went in backwards, the positive connection would be front/left, and the leads could NEVER reach that far - in fact no further than an inch or so from the correct position.

Therefore, I cannot understand how the battery could ever be connected the other way round.

I stress, that I've never seen under the bonnet of any other 500 than mine, so mine could well be different to the OPs.

Best wishes for the season,
Mick.
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Old 23-12-2016   #15
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Re: installed dbattery backward

Well it is an American car so could be different?
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