New problem!!!!!!

[punisher72]

Well i certainly hope my alternator was stuffed before i disconnected the battery I will have to wait for the leckys to come back to work to get it checked  Merry christmas everyone 

[punisher72]

I tried another alternator today that we know that works and i still have the same problem  When reving the volts went up to 12.6!!!!!!!!! There has to be a problem with the wiring? We checked my mates barracuda and his went up to 15 volts. Can anybody shed some light? Please!!! Happy new year btw 

[dodj]

If I remember right, the battery is in the boot  ,the battery is new, alternator good, voltage regulator been changed?. Stock electrical wiring or modified? I know there was another thread that might have answered these questions but I didn't find it. Charging through the bulkhead connector or direct wire from alt to bat?

[JayBee]

I'm curious, when you rev the motor, are you getting the same voltage at the battery AND the alternator output? Here's what my service manual says:
 

[punisher72]

While idiling the battery reads 12.10 and the alternator reads 11.94. While revving to around 2500rpm the batt is 12.37. The alternator wasnt doing this yesterday when checked but now it jumps from 11.94 to 16 volts very quickly,the numbers are nearly a blur? Any ideas? yesterday it read 12.6 consistently when revving now its up and down like a jack in the box?

If I remember right, the battery is in the boot  ,the battery is new, alternator good, voltage regulator been changed?. Stock electrical wiring or modified? I know there was another thread that might have answered these questions but I didn't find it. Charging through the bulkhead connector or direct wire from alt to bat?

dodj  the alternator has an extra wire feeding straight to the starter relay,which is straight to the battery. Im running a 6al msd box standard distributor and the wiring is mostly all stock!

[dodj]

Nothing like a problem that moves around on you You have any hair left?  
Anyway, with the charge rate changing on you, it sounds like a grounding issue, loose connection, or a bad wire. I would first go over the engine to firewall ground connection AND the battery to frame connection (I know, again) just to be sure. Then make sure the VR (was it swapped out? if not it would be a good idea) is well grounded to the firewall. Then I would check the VR connector to make sure both wires are getting good solid contact to the VR. Then I would follow the two F wires from the alt to the VR. The blue one will come to a 5 way junction, the green will go straight from the alt to the VR. Check the insulation for cracks, signs of too much heat, discolouration, etc...
I would also check the newer wire from the alt to the start relay. The start relay isn't very big and sometimes the connections on the stud get a little crowded and loosen up/corrode on you. Just make sure they are tight and clean.
I've been looking into moving to Australia in the next year or two (3?), hopefully this gets solved before I get there.

[punisher72]

Hahaha  Cheers dodj. I will check all that you have said! The vr is original and i didnt know it had to be grounded? I was going to mow the lawn but its raining now  so time to play cars 

[dodj]

The vr is original and i didnt know it had to be grounded?

It just grounds through the firewall mounting bolts, not a separate wire. It would be possible for someone to paint the VR case and interrupt the ground that is supposed to exist from the case through the bolt to the firewall, but it's not likely - just possible. The vr won't work properly if it isn't grounded.
I was just watching the news. NS Wales is getting pretty wet -your area?

[punisher72]

Hey mate. Im in queensland just ova from the nsw border  The best state to be in  I took the vr off and made sure it was earthed and also i replaced the earth strap from the motor to body and the battery earth.They were a bit sus!! havent checked the charging yet but will tomoz. 

[punisher72]

After i changed an checked all the earths the volts still fluctuate flatout? Im going to have to take to an elecky

[dodj]

Change the regulator.

[73EStroker]

Punisher - are you in Tweed Head/Coolangatta area? This ex-kiwi had a great time at the guest houses they used to have there back in xmas 74. 

[Moparinho]

I tried another alternator today that we know that works and i still have the same problem  When reving the volts went up to 12.6!!!!!!!!! There has to be a problem with the wiring? We checked my mates barracuda and his went up to 15 volts. Can anybody shed some light? Please!!! Happy new year btw 

have you check the alternator drive belt ?  it can be too much tight or loose.  Check it or replace it.
 

[dodj]

 :popcorn:bump

[punisher72]

hey guys. Im back at work now! I will try an work something out in the next week or so?