Hey, I'm installing a subwoofer into my sisters Grande Punto but I can't seem to find the best ground connection in the boot. I've tried many places but they're just not good enough.

For anyone else who has installed a subwoofer in their Grande Punto, if you dont mind, could you show me the best place to insert my ground wire?

I'm not willing to spend much money because installing it professionally is costly. Right now I've done everything else right but it's just the ground wire which I need to find the best ground for.

I've even scraped paint away from the side panels of the boot but it's still ridiculously hard to find a good place to insert the ground wire.

Help? :bang:

lift the boot carpet up and youwill see 2 black metal plates undo one of them and use that thats where mine is and its fine

Ive grounded mine under the boot latch, and seems to be ok.

Don’t know if anyone else has done this, and if its any good, but it works fine for me. You have to remove the plastic panel though to get at it.

Boot Latch is okay but needs the plastic panel taken off, and you can see the cable if you look closley, mine is earthed to the rear seat bracket, just unscrewed the closest bolt and wrapped my earth around, from here you can put the cable down inbetween the plastic trim so its hidden.

Just go back to the battery

remove boot seal

remove boot trim plastic (2x pozzi screws and torx boot spring Bolt/ landing (the funny round bolt with the star shaped head to the left of the boot catch)

pull up trim

look in the left of the boot there is a m10 nut with all the earths together try that

I used the earths for the rear lights, but on other peoples cars I have used the bolts that hold the seats/ seat belts in.
There is no need to go all the way back to the battery, any thing that goes into the shasy will do. Or even drill and tap your own earth if you really struggling

Back to the battery is the best and safest earth

DJSparky said:

Back to the battery is the best and safest earth

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The negative terminal on the battery is grounded to the car body, so any metal panel connected to this will be the same

But its still the best earth.. Im not arguing im just saying that is the best earthing point : )

Depends on what size cable your running back to the -ative terminal there will be far less voltage drop and resistance IMO going to a decent ground on the chassis of the car the Earth strap must me 15-20mm2 ish bolted to the front chassis leg

Left hand side of the boot, lift the carpet on the wheel arch and there are 3 hexagonal shaped holes (not sure why they are there) sand the paint down, pop a bolt through the back and screw a nut on, jobs a good'un.

sorry guys I know this was a while go but I'm struggling with getting power to my subwoofer on my grande punto, i am sure that I have wired it up properly, have you got an image as to where abouts on the battery you wired it up to? Thanks

mrtayloralex said:

sorry guys I know this was a while go but I'm struggling with getting power to my subwoofer on my grande punto, i am sure that I have wired it up properly, have you got an image as to where abouts on the battery you wired it up to? Thanks

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The positive terminal..........

get us a picture of the top of your battery (as there are a few different configurations between models and ages) need a pic with the battery cover off ideally (little plastic cap over one of the terminals unless its dropped off)

turns out there was power running to the subwoofer as we tested it but the sub didnt seem to want to work, I think i am going to have to take it back to the shop and ask them, I have grounded by the boot, just the sub isnt working

mrtayloralex said:

turns out there was power running to the subwoofer as we tested it but the sub didnt seem to want to work, I think i am going to have to take it back to the shop and ask them, I have grounded by the boot, just the sub isnt working

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have you given it a switched live signal?

sorry i am really not technical like that haha, how would you do it? we checked that there was power using that device thing (lit up telling us there was power)

Andy Monty said:

have you given it a switched live signal?

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mrtayloralex said:

sorry i am really not technical like that haha, how would you do it? we checked that there was power using that device thing (lit up telling us there was power)

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As Andy has said
Yes they may be a full circuit of power for the sub
However - they need a ""wake up / turn on / power up "" signal from the HU
Without this - the sub will stay idle

Also is it just a light tester? A multi-meter would be better it'd tell you if it was a decent signal or not

Ziggy

like this