Please Help
Thread Starter
Track Day
Joined: Dec 2015
Posts: 24
Likes: 0
Please Help
Hi Again
This is my second attempt to get help on this.
I've read, I swear a lot, and perhaps I think I understand how the charging system works now, I just want to confirm my theory is right.
IN the attached picture there are 3 points
Black is Negative
Red is B+
Yellow is the cluster bulb
Is it right the cluster bulb is a negative lead to the alternator, and a positive lead in the other end, that turns into a positive when the car starts and the light goes off?
My car is not charging at all, and the light of course is not turning on. If I use the tester and check continuity with the car off, between the black lead (ground) and the yellow lead (bulb) it is correct that we should have continuity with the car off?
I am at the point of buy a new alternator, but I need to make sure thats the problem first.
ONe more time, thanks again
This is my second attempt to get help on this.
I've read, I swear a lot, and perhaps I think I understand how the charging system works now, I just want to confirm my theory is right.
IN the attached picture there are 3 points
Black is Negative
Red is B+
Yellow is the cluster bulb
Is it right the cluster bulb is a negative lead to the alternator, and a positive lead in the other end, that turns into a positive when the car starts and the light goes off?
My car is not charging at all, and the light of course is not turning on. If I use the tester and check continuity with the car off, between the black lead (ground) and the yellow lead (bulb) it is correct that we should have continuity with the car off?
I am at the point of buy a new alternator, but I need to make sure thats the problem first.
ONe more time, thanks again
Advanced
Joined: Mar 2017
Posts: 53
Likes: 0
From: SW Florida
The auto zone suggestion is a good one. But to answer you question, you should have 3 leads on your alternator. D+ (blue) goes to the dash light and the regulator. D-(brown) and B+ to the battery. When you turn on the ignition you should have the light come on as you don't have voltage on D+. When the engine starts and the alternator turns it will put voltage on D+ and and the light goes out.
Thread Starter
Track Day
Joined: Dec 2015
Posts: 24
Likes: 0
Thanks
Maybe you haven't seen but I am not US based. We have had the alternator checked, but the D+ lead should be ground when car is off, right? and Positive when Alternator is spinning. I purchased a new alternator already, so expecting to come on the mail soon.
Thanks in advance.
Maybe you haven't seen but I am not US based. We have had the alternator checked, but the D+ lead should be ground when car is off, right? and Positive when Alternator is spinning. I purchased a new alternator already, so expecting to come on the mail soon.
Thanks in advance.
Advanced
Joined: Mar 2017
Posts: 53
Likes: 0
From: SW Florida
Yes. ground potential when the engine is stopped and positive when the alternator is spinning.
While you're at it I suggest you check and confirm a good ground from the engine case to the alternator housing. This is a problem I just fixed on mine after years of poor charging.
Good luck
While you're at it I suggest you check and confirm a good ground from the engine case to the alternator housing. This is a problem I just fixed on mine after years of poor charging.
Good luck
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Rennlist Member
Joined: Nov 2008
Posts: 2,114
Likes: 294
From: Grapevine, TX
Did you ever run the tests I mentioned in your previous thread to determine that the charge indicator light was working correctly and providing the necessary 12V to the alternator via the blue wire?
You need to ensure that the charge light is working correctly, or it is unlikely that the system will charge even with a new alternator.
If you need any more details than what i put in your other thread, just let me know.
You need to ensure that the charge light is working correctly, or it is unlikely that the system will charge even with a new alternator.
If you need any more details than what i put in your other thread, just let me know.
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