Alternator wiring :)

GJUK · Post by **GJUK** » Mon Apr 28, 14 11:03 am

Hi,

In order to improve my charging system, I have bought this:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... OU:GB:3160

I was recommended the above alternator should fit and provide a nice light addition to the car.

Can anyone point me in the direction for how to convert my external voltage regulator system to this new alternator?

Thanks

Jon

Blue · Post by **Blue** » Mon Apr 28, 14 11:31 am

Yep, the large cable to the battery connects to the stud, from the "IG" terminal, run a new wire to the wire on the ignition switched feed to the voltage reg. Chuck the voltage reg over your shoulder and crack a cold one...

GJUK · Post by **GJUK** » Mon Apr 28, 14 11:49 am

Blue wrote:Yep, the large cable to the battery connects to the stud, from the "IG" terminal, run a new wire to the wire on the ignition switched feed to the voltage reg. Chuck the voltage reg over your shoulder and crack a cold one...

Thanks Blue.

Can I run the alternator to the starter motor - where the battery is. Or Do I have to run it back to the battery (which is in the boot)

Thanks.

Jon

Guy · Post by **Guy** » Mon Apr 28, 14 12:27 pm

To the starter will be fine Jon

Blue · Post by **Blue** » Mon Apr 28, 14 12:28 pm

Yes that should work.

GJUK · Post by **GJUK** » Mon Apr 28, 14 12:30 pm

Thanks boys.

GJUK · Post by **GJUK** » Fri May 02, 14 9:13 pm

Blue wrote: from the "IG" terminal, run a new wire to the wire on the ignition switched feed to the voltage reg.

Which wire is that please ?

I take it if I unplug the voltage regulator, both will read 0 if the ignition is off. Then one of the cables will read 12v when the ignition is on? Thats the one I want?

I've fitted the alternator but not done the above bit, just run the 12v feed from the alternator to the battery and im still getting the 11.89v issue. I guess I need to do this IG to other cable bit?

Thanks

Jon

GJUK · Post by **GJUK** » Fri May 02, 14 10:12 pm

Just to add,

I am now getting 12.15 v from the alternator stud.

But still getting 11.89 v at the battery.

Is this okay or still not okay?

Thanks

JohnR · Post by **JohnR** » Fri May 02, 14 10:17 pm

The alternator needs to know how much to put into the battery , so you have to have a sensor feed to the voltage regulator so it knows how much charge to put in , on a Lucas or Bosch unit the small wire that is on the plug at the rear of the unit goes via a 2.2 watt bulb to the ign feed wire , when the alternator output makes more than is in the battery the light goes out and it starts charging, just like on your daily ( the light with the battery symbol on it )

On another note the battery is only built to take so many full cycles in other words from full charge to full discharge and back again so every time you start the engine it is a fraction of the cycle when you have nothing to do you can sit there and work it out based on the an hour of the battery , draw of the starter motor,any other electrical load that is not ign controlled etc etc etc

Blue · Post by **Blue** » Sat May 03, 14 11:08 am

Yes you connect the wire that is live when the ignition is switched on connected to IG, then it should charge. If you wanted to fit a charging light, connect a wire to to the L terminal to one side of a bulb holder and connect the other side to a switched live. the light will come on when you turn on the ignition and go out when the alternator starts charging. This type of alternator does not need to have a light to work so you don't have to fit one.

terryr · Post by **terryr** » Sat May 03, 14 1:20 pm

ive got one in the garage ,seeing as it sounds that easy I may fit it ,does trev do brackets for a smallblock ,I know he knocked some up for bb

Mossy68 · Post by **Mossy68** » Sat May 03, 14 2:26 pm

terryr wrote:ive got one in the garage ,seeing as it sounds that easy I may fit it ,does trev do brackets for a smallblock ,I know he knocked some up for bb

I think he was planning to.
I know he was after a small block to mock stuff up Not sure if he has one yet or if he has made any SB brackets ?

Blue · Post by **Blue** » Sat May 03, 14 2:43 pm

He's about to, got the bits in the back of the car ready to give him.

terryr · Post by **terryr** » Sat May 03, 14 6:01 pm

Thats handy

GJUK · Post by **GJUK** » Sat May 03, 14 9:38 pm

You guys are amazing, my car is now charing 13.5 ish (goes up and down) v at the alternator and battery now.

Old one and stupid external voltage regulator has been chucked over the shoulder.

First time out in the dart today since the new expensive sump and cage. Yay for petrol stations

Thanks all, very much.

Jon