Battery relocation gone wrong!

[markmcgivern]

Hi guys,
Bit of a strange one. So I have very recently relocated my battery to the boot using an Odysey pc680. Did a nice neat job and using a thick wire. Not had any problems. It's done about 80 miles. However almost got home today and the dam thing was firing on 3 cylinders and in the end gave up. Left the car on the side of the road for 30 minutes and towed it home. Felt the battery when I got home and it was hot! So it must have been roasting. . . Under the bonnet I put the ecu (gen90) where the battery sits as a temporary measure, however it must have vibrated loose. The voltage in the battery was 3.5v! Tested the car with old battery and it fired back into life.
So any gurus out there know why A- the battery cooked? Is it linked to the ecu becoming loose nd not ezrthed?
I have yet to check the alternator to see what bolts it's kicking out but I'll be surprised if it is this that caused it? Could be wrong
Hope you guys can shed some knowledge
Thanks
Mark

 

[NorthloopCup]

You need to check the voltage that the alternators putting out for a start.

What size cable did you use?
Is the earth cable the same thickness as the positive cable?
Is it a good earth point that you’ve got?

Running a battery in the boot requires good quality thick cabling to cope with the flow.

 

[markmcgivern]

It is yes I'll measure it. Earth strap is marginally smaller? Earth is bolted 12 inches from battery using one of the old rear seat belt anchor bolts. Never struggles to start . I'll check alternator tomorrow evening and report back. I'm hoping I can charge the battery and it's ok?!

 

[Ol’ Tarby]

If the battery is reading 3.5volts, then it's fucked im afraid. I can't see that recovering at all

 

[markmcgivern]

I'm in the process of reverting back to the old battery for now. I took a photo of the cable used. It's 6mm in diameter which equates to 28mm2. Not small?! Earth was the old battery earth from under bonnet.
Will report back once I get it fired up and test the alternator.
I HATE ELECTRICS

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[markmcgivern]

Here are pics of said wiring and farthing point. Bit of a bodge using the eye but I thought it would be good for an earth point

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[markmcgivern]

Grrr
I have just this minute connected old battery up and as soon as i did a horrible smell is coming from back of alternator. Started the car fine, tested back of alternator red lead to live and black lead to earth. Fluctuating readings including up to -6v and also checked battery end 10.3v.
So we have a fucked alternator

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[markmcgivern]

If the battery is reading 3.5volts, then it's fucked im afraid. I can't see that recovering at all

Battery is brand new, fingers crossed it seems to be charging, after 2 hours it's at 11.7v

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[bloke]

Battery is brand new, fingers crossed it seems to be charging, after 2 hours it's at 11.7v

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they're shite!!! seen so many of them throw in the towel after hardly any use, wouldn't recommend them to anyone.

 

[markmcgivern]

they're shite!!! seen so many of them throw in the towel after hardly any use, wouldn't recommend them to anyone.

Good news is battery is fine and alternator is fine, bad news is I'm a dope! It was a poor earth

 

[bloke]

Good news is battery is fine and alternator is fine, bad news is I'm a dope! It was a poor earth

lucky one though ?

 

[dumdum]

Whenever you make a new Earth make sure you clean the chassis where the earth is made and then coat it is grease to prevent corrosion, seat belts are a crap Earth unless you clean them, kids love earthing amps there and wonder why you get noise

 

[R29TJR]

they're shite!!! seen so many of them throw in the towel after hardly any use, wouldn't recommend them to anyone.

What would you recommend?

Tom

 

[bloke]

What would you recommend?

Tom

Know a few people who've ran powervamp even as a daily and they've not had a problem.

The oddest just seem to be so fussy and go flat if you give them a funny look!!!!

 

[R29TJR]

Know a few people who've ran powervamp even as a daily and they've not had a problem.

The oddest just seem to be so fussy and go flat if you give them a funny look!!!!

I've spent a few hours looking and I think they have stopped making there own batteries? Can't seem to find them anywhere.


Tom

 

[bloke]

Not looked for a while, only ever looked for them on eBay though.