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Alternator problems-

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By (user no longer on site) OP   
over a year ago

So I fitted a new alternator and forgot to disconnect the battery- the live wire arcd out on the casing and blew the fusible link on the battery terminal.

Getting a new genuine one tomorrow but how best to test the new alternator and system?

Annoying as I hope I’ve not Fucked the new one!!

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By (user no longer on site)
over a year ago

Big sound system

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By (user no longer on site) OP   
over a year ago

Lol - never been into ICE i like stripped out raw driving

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By (user no longer on site)
over a year ago

Doubt you have done any damage, fit fuse and see tomorrow, seen people fit earth to pos then refit bat Lead and it’s not till you smell it you know it’s to late!

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By *eus n EuropaCouple
over a year ago

louth


"So I fitted a new alternator and forgot to disconnect the battery- the live wire arcd out on the casing and blew the fusible link on the battery terminal.

Getting a new genuine one tomorrow but how best to test the new alternator and system?

Annoying as I hope I’ve not Fucked the new one!!"

Shorting live to earth should not damage your altinator depending on the car you may have lost any radio codes or immobiliser codes fingers crossed for you

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By (user no longer on site) OP   
over a year ago

I’ve lost half of the systems as the 2 120 amp links are split 50/50 it seems

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By *he Silver FuxMan
over a year ago

Uttoxeter


"So I fitted a new alternator and forgot to disconnect the battery- the live wire arcd out on the casing and blew the fusible link on the battery terminal.

Getting a new genuine one tomorrow but how best to test the new alternator and system?

Annoying as I hope I’ve not Fucked the new one!!"

You’ll have shorted the battery via the alternator casing - there’ll have been no circuit through windings etc so you’ll be okay. Connect up and THEN reconnect the battery. Start engine and raise the revs to about twice idle RPMs, hold RPM and put a voltmeter across the battery terminals. 14volts and above but no more than 15 will mean you are good to go. You’ll always disconnect the battery from now on... ??

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By (user no longer on site) OP   
over a year ago

Absolutely!! Thought i had

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By (user no longer on site)
over a year ago

Oddly enough the flow of current actually goes backwards on DC so your "live" wire is your bodywork and your return path is your cable hence why you've blown your fuses by touching your return path to the "live" bodywork.

Unfortunately nobody noticed this for many decades so it's always just been left that way

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By (user no longer on site) OP   
over a year ago

I hate electronic stuff- can’t be fixed by hammer lol

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By (user no longer on site)
over a year ago


"I hate electronic stuff- can’t be fixed by hammer lol"
.

The good news is the current never went through your alternator

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By (user no longer on site) OP   
over a year ago

I’ll let you know later if it’s Fucked- it starts and runs no problem but odd systems don’t work as similar to brakes it has a split circuit sono fog lights, blower or central locking yet

Costs £40 for a genuine new printed fuse link that connects to the positive post from dealer so not too bad, but lessons learned.

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By (user no longer on site)
over a year ago

Now you know why it has a fuse

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By (user no longer on site)
over a year ago

I always disconnected the battery when doing anything more than topping up fluids after an incident many years ago.

I was torquing up the cylinder head on a mkII escort and realised the wrench would touch the battery positive so moved my hand to be between the two.

My engagement ring made the circuit!!!

I removed my now C shaped ring and ran it under a tap. My finger had a ring shaped bubble all the way around it for a few days.

Never again!

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By (user no longer on site) OP   
over a year ago

I know of an incident same as you describe- but he lost the whole finger as it glowed red and cauterised it

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By (user no longer on site)
over a year ago


"I always disconnected the battery when doing anything more than topping up fluids after an incident many years ago.

I was torquing up the cylinder head on a mkII escort and realised the wrench would touch the battery positive so moved my hand to be between the two.

My engagement ring made the circuit!!!

I removed my now C shaped ring and ran it under a tap. My finger had a ring shaped bubble all the way around it for a few days.

Never again! "
.

Always disconnect the negative batteries flow in reverse from negative to positive.

The electrons are flowing through the car bodywork back to the battery!

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By *he Silver FuxMan
over a year ago

Uttoxeter


"I always disconnected the battery when doing anything more than topping up fluids after an incident many years ago.

I was torquing up the cylinder head on a mkII escort and realised the wrench would touch the battery positive so moved my hand to be between the two.

My engagement ring made the circuit!!!

I removed my now C shaped ring and ran it under a tap. My finger had a ring shaped bubble all the way around it for a few days.

Never again! "

This fellas. This. Is. Sexy. Just image that bum in a tight pair of overalls as she’s leaning into the engine bay of a MkII escort with a torque wrench AND she knows what to do with it. Just want to meet and talk about tuning Ford Crossflows....

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By *he Silver FuxMan
over a year ago

Uttoxeter


"I always disconnected the battery when doing anything more than topping up fluids after an incident many years ago.

I was torquing up the cylinder head on a mkII escort and realised the wrench would touch the battery positive so moved my hand to be between the two.

My engagement ring made the circuit!!!

I removed my now C shaped ring and ran it under a tap. My finger had a ring shaped bubble all the way around it for a few days.

Never again! .

Always disconnect the negative batteries flow in reverse from negative to positive.

The electrons are flowing through the car bodywork back to the battery! "

Actually there’s a reason for disconnecting the negative - if you disconnect only the positive terminal and a tool or chain etc falls or gets placed across the battery positive to any uninsulated part of the car, body or engine etc a short circuit will form. By disconnecting the negative terminal the car is now isolated from the battery circuit and accidental short circuits can’t happen. Also the positive terminal can have additional accessory wiring attached which is best left undisturbed. I keep a couple of plastic terminal caps that come with new batteries in my tool box so I can completely protect against accidental shorts.

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By (user no longer on site) OP   
over a year ago

I’ve seen on battery on charge pop/ explode- let’s just say it didn’t fuck about- luckily the lad wasn’t facing it but a rapid wash was required

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By (user no longer on site) OP   
over a year ago

It’s not Fucked lol all systems are ok just a blown fuse. Sweating a big bill can stop

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By (user no longer on site)
over a year ago


"It’s not Fucked lol all systems are ok just a blown fuse. Sweating a big bill can stop"

Good to know the fuse did it’s job

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By (user no longer on site) OP   
over a year ago

It totally melted a 120 amp fuse, some power in those batteries!

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By (user no longer on site)
over a year ago


"I always disconnected the battery when doing anything more than topping up fluids after an incident many years ago.

I was torquing up the cylinder head on a mkII escort and realised the wrench would touch the battery positive so moved my hand to be between the two.

My engagement ring made the circuit!!!

I removed my now C shaped ring and ran it under a tap. My finger had a ring shaped bubble all the way around it for a few days.

Never again!

This fellas. This. Is. Sexy. Just image that bum in a tight pair of overalls as she’s leaning into the engine bay of a MkII escort with a torque wrench AND she knows what to do with it. Just want to meet and talk about tuning Ford Crossflows.... "

My last one was a 1760 with an A2 cam, side draught 40’s, high compression head (flowed and ported).

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By (user no longer on site) OP   
over a year ago

Nice- can’t help but appreciate good engineering, second only to Christina Aguilera lol

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By *uteLittleGeekWoman
over a year ago

Somewhere

You earn living as a mechanic and you are asking on fab forums a question like this ?

Maybe you should review your competences !!

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By (user no longer on site) OP   
over a year ago

I’m not an auto electrician- checked everything I could and am not afraid to ask for advice/ second opinions.

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By *he Silver FuxMan
over a year ago

Uttoxeter


"I always disconnected the battery when doing anything more than topping up fluids after an incident many years ago.

I was torquing up the cylinder head on a mkII escort and realised the wrench would touch the battery positive so moved my hand to be between the two.

My engagement ring made the circuit!!!

I removed my now C shaped ring and ran it under a tap. My finger had a ring shaped bubble all the way around it for a few days.

Never again!

This fellas. This. Is. Sexy. Just image that bum in a tight pair of overalls as she’s leaning into the engine bay of a MkII escort with a torque wrench AND she knows what to do with it. Just want to meet and talk about tuning Ford Crossflows....

My last one was a 1760 with an A2 cam, side draught 40’s, high compression head (flowed and ported). "

A 1660 A2 twin 40s with stage 3 head went in my Westfield I built many years ago. The exhaust manifold was made by a pipe welder in Plymouth Naval dockyard in CuNi and was a work of art

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By (user no longer on site)
over a year ago


"I always disconnected the battery when doing anything more than topping up fluids after an incident many years ago.

I was torquing up the cylinder head on a mkII escort and realised the wrench would touch the battery positive so moved my hand to be between the two.

My engagement ring made the circuit!!!

I removed my now C shaped ring and ran it under a tap. My finger had a ring shaped bubble all the way around it for a few days.

Never again!

This fellas. This. Is. Sexy. Just image that bum in a tight pair of overalls as she’s leaning into the engine bay of a MkII escort with a torque wrench AND she knows what to do with it. Just want to meet and talk about tuning Ford Crossflows....

My last one was a 1760 with an A2 cam, side draught 40’s, high compression head (flowed and ported).

A 1660 A2 twin 40s with stage 3 head went in my Westfield I built many years ago. The exhaust manifold was made by a pipe welder in Plymouth Naval dockyard in CuNi and was a work of art "

I’ve got pictures of the exhaust manifolds of one of my current cars just because they were a work of art. E36 M3 evo 3.2. The pipes are huge and all six together curving around seemingly impossibly.

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