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Old 28-06-2017   #16
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Re: Battery Charging Issues

Quote Originally Posted by Davren View Post
Are you using a DC only or AC + DC amp clamp? The much cheaper AC only clamps won't measure DC.

Are you clamping it around only one of the main battery cables? Clamping it around both cables will cancel out any reading.



As suggested above, it's not a good idea to run the alternator with the battery disconnected. It can cause serious damage to the alternator diodes.



It's a large black or grey box fitted under the bonnet (hood) similar to the picture below. If it's there, you can't miss it.



If it's been modified to the later internally regulated alternator, the external regulator would have been removed. You should be able to see wiring modifications where the external regulator was mounted.

Are you sure it's a 1976 car, and not a later one? Several members on here have been confused as to which year there Spiders are. The identification pages below should confirm which you have.

You may also get some clues from the diagram of the two different alternators for the up to, and post 1976 models from the parts catalogue.
.
Will investigate Jackwhoo's suggestion there could be a problem with the wire from the alternator to the battery. We will not run the engine with the battery disconnected.

I should have mentioned from the get-go that I have a background in electrical engineering.
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Old 28-06-2017   #17
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Re: Battery Charging Issues

Quote Originally Posted by Davren View Post
Are you using a DC only or AC + DC amp clamp? The much cheaper AC only clamps won't measure DC.

Are you clamping it around only one of the main battery cables? Clamping it around both cables will cancel out any reading.



As suggested above, it's not a good idea to run the alternator with the battery disconnected. It can cause serious damage to the alternator diodes.



It's a large black or grey box fitted under the bonnet (hood) similar to the picture below. If it's there, you can't miss it.



If it's been modified to the later internally regulated alternator, the external regulator would have been removed. You should be able to see wiring modifications where the external regulator was mounted.

Are you sure it's a 1976 car, and not a later one? Several members on here have been confused as to which year there Spiders are. The identification pages below should confirm which you have.

You may also get some clues from the diagram of the two different alternators for the up to, and post 1976 models from the parts catalogue.
.
I am using a clamp that measures both AC and DC. I am only clamping around one battery cable. I should have mentioned I have a background in electrical engineering to save you and Jackwhoo some time explaining. You have given me some good leads as to determining if there is, indeed, a voltage regulator, where to look for it, determine if there is a wire issue, etc. I will keep you posted as to what I find out. Yes, I am certain it's a 1976 Fiat. I have the original bill of sale and the manual (with a few chunks out of the cover thanks to a hungry mama mouse).
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Old 28-06-2017   #18
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Re: Battery Charging Issues

Quote Originally Posted by fiat76 View Post
Will investigate Jackwhoo's suggestion there could be a problem with the wire from the alternator to the battery. We will not run the engine with the battery disconnected.

I should have mentioned from the get-go that I have a background in electrical engineering.
You can just run a wire of the correct gauge from the alternator output connector to the battery +ve
On some old British cars the out put wires were a pair in order to keep the gauge small enough to be easily manipulated in the wiring loom. Depending on your alternator connector you may choose to do the same.

Even if you had mentioned your back ground ,similar questions may have been asked. Not to talk down to you or annoy you . in my opinion best to avoid assuming what has been done and how.

If you find a voltage regulator on the front wing car still may have had later alternator fitted , separate voltage regulator may have been disabled but left in place to look original.
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Old 28-06-2017   #19
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Re: Battery Charging Issues

If your alternator has a number of round holes all over rear face it is a marelli with external regulator.
If rear of alternator has a big red part then its marelli with internal regulator.
If alternator has elongated holes at edge of rear face then it's Bosch with internal regulator.
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Last edited by jackwhoo; 28-06-2017 at 18:06.
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Old 28-06-2017   #20
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Re: Battery Charging Issues

Quote Originally Posted by jackwhoo View Post
You can just run a wire of the correct gauge from the alternator output connector to the battery +ve
On some old British cars the out put wires were a pair in order to keep the gauge small enough to be easily manipulated in the wiring loom. Depending on your alternator connector you may choose to do the same.

Even if you had mentioned your back ground ,similar questions may have been asked. Not to talk down to you or annoy you . in my opinion best to avoid assuming what has been done and how.

If you find a voltage regulator on the front wing car still may have had later alternator fitted , separate voltage regulator may have been disabled but left in place to look original.
Thanks, Jackwhoo! Oh, no...NOT annoyed at all. You are right, best to cover all the bases and never assume! The advice we have received has been a great help, and we appreciate the timely support. We (I am at the computer end and he is on the car end) will keep you posted on the outcome. Now we have some "direction"!
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Old 28-06-2017   #21
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Re: Battery Charging Issues

Quote Originally Posted by fiat76 View Post
Thanks, Jackwhoo! Oh, no...NOT annoyed at all. You are right, best to cover all the bases and never assume! The advice we have received has been a great help, and we appreciate the timely support. We (I am at the computer end and he is on the car end) will keep you posted on the outcome. Now we have some "direction"!
Google
fiat 124 spider alternator

Click videos, the first result should explain it nicely.
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