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post #1 of 9 (permalink) Old 12-04-2014, 06:03 PM Thread Starter
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Charging system

I'm new to classic truck technology and I could use some help on a few issues. I'm having trouble charging my battery on 66F100 352. I installed new alternator, external voltage regulator and still have no charging. The voltmeter is a continuous 12 volts even when reved up. I did notice my dash alternator light slowly disappear with a high rev? My dash amp meter gauge shows very slightly less than 0 (-). Several friends have stated the one wire alternator is the way to go, since wires are original, very brittle. Not sure!!! Any help?
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post #2 of 9 (permalink) Old 12-05-2014, 09:30 AM
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Re: Charging system

Welcome to the Forums. Fortunately, we have auto parts stores that want your business, and provide free charging system testing. No purchase required. Take your truck to your preferred store and have them run tests on it to identify the problem. If the testing does not give specific answers, each component (alternator, regulator, battery, etc.) can be pulled and bench-tested for defects. You should be able to leave knowing what the problem is and what you need to do about it.

If not, or if you prefer, you can run your own tests to find the issue(s). In that case, I suggest you get a copy of the Ford Shop Manual for your truck, and a cheap meter to test with. Post back here for guidance at that point for how to test wiring and components.

David

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post #3 of 9 (permalink) Old 12-08-2014, 09:23 AM
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Re: Charging system

You don't need no 1-wire setup. Sounds like bad wire connection. First thing I did with mine was sanded/cleaned all ground connections - battery (-) to starter mounting bolt, block to frame, frame to Alt (-), block to firewall. Then sand/clean your (+) and (F) lug connectors to Alt. Fire it up and should get close to 14V between + and - battery terminals.
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post #4 of 9 (permalink) Old 10-08-2015, 07:00 PM
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Re: Charging system

Quote:
Originally Posted by 66AJ View Post
I'm new to classic truck technology and I could use some help on a few issues. I'm having trouble charging my battery on 66F100 352. I installed new alternator, external voltage regulator and still have no charging. The voltmeter is a continuous 12 volts even when reved up. I did notice my dash alternator light slowly disappear with a high rev? My dash amp meter gauge shows very slightly less than 0 (-). Several friends have stated the one wire alternator is the way to go, since wires are original, very brittle. Not sure!!! Any help?
If the wires are visibly deteriorated (brittle/cracked/broken insulation) they will arch to the nearest ground when "hot" causing loss of continuity. Trace all of them from start to end and replace as needed, one at a time.
Just a hint...use one gauge heavier wire (e.g.: if it's 16ga wire...replace it with 14ga wire).
They worked well in gauge size when new, but could always use a little boost.
Ensure that ALL of the vehicle's grounds are secure with clean protected/coated connections. Voltmeter should show 13 to 14 out of the alternator and 12 to 13 at battery.
The next question would be....What alternator did you replace the previous one with? It does make a difference.
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post #5 of 9 (permalink) Old 10-08-2015, 07:06 PM
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Re: Charging system

Quote:
Originally Posted by Andy82GT View Post
You don't need no 1-wire setup. Sounds like bad wire connection. First thing I did with mine was sanded/cleaned all ground connections - battery (-) to starter mounting bolt, block to frame, frame to Alt (-), block to firewall. Then sand/clean your (+) and (F) lug connectors to Alt. Fire it up and should get close to 14V between + and - battery terminals.
This does not address the thread poster's stated issue of "brittle wiring".
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post #6 of 9 (permalink) Old 10-08-2015, 07:14 PM
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Re: Charging system

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Originally Posted by PSIG View Post
Welcome to the Forums. Fortunately, we have auto parts stores that want your business, and provide free charging system testing. No purchase required. Take your truck to your preferred store and have them run tests on it to identify the problem. If the testing does not give specific answers, each component (alternator, regulator, battery, etc.) can be pulled and bench-tested for defects. You should be able to leave knowing what the problem is and what you need to do about it.

If not, or if you prefer, you can run your own tests to find the issue(s). In that case, I suggest you get a copy of the Ford Shop Manual for your truck, and a cheap meter to test with. Post back here for guidance at that point for how to test wiring and components.

David
Fortunately for the auto parts stores there are advertisers that post reply's such as this in response to honest inquires such as this one, for answers to questions in which these forums were created.....seriously??
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post #7 of 9 (permalink) Old 10-08-2015, 07:25 PM
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Re: Charging system

Quote:
Originally Posted by 66AJ View Post
I'm new to classic truck technology and I could use some help on a few issues. I'm having trouble charging my battery on 66F100 352. I installed new alternator, external voltage regulator and still have no charging. The voltmeter is a continuous 12 volts even when reved up. I did notice my dash alternator light slowly disappear with a high rev? My dash amp meter gauge shows very slightly less than 0 (-). Several friends have stated the one wire alternator is the way to go, since wires are original, very brittle. Not sure!!! Any help?
If the wires are visibly deteriorated (brittle/cracked/broken insulation) they will arch to the nearest ground when "hot" causing loss of continuity. Trace all of them from start to end and replace as needed, one at a time.
Just a hint...use one gauge heavier wire (e.g.: if it's 16ga wire...replace it with 14ga wire).
They worked well in gauge size when new, but could always use a little boost.
Ensure that ALL of the vehicle's grounds are secure with clean protected/coated connections. Voltmeter should show 13 to 14 out of the alternator and 12 to 13 at battery.
The next question would be....What alternator did you replace the previous one with? It does make a difference.
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post #8 of 9 (permalink) Old 10-09-2015, 09:05 AM
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Re: Charging system

Quote:
Originally Posted by 84ordF150 View Post
Fortunately for the auto parts stores there are advertisers that post reply's such as this in response to honest inquires such as this one, for answers to questions in which these forums were created.....seriously??
I have no idea what you are talking about. Please re-phrase or explain your statements.

David

-=≡ If it was easy everyone would do it ≡=-
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post #9 of 9 (permalink) Old 10-13-2015, 04:55 PM
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Re: Charging system

a bad ground can cause problems. check all the grounds, motor to truck, truck to frame. -battery to frame. I have the one wire on my truck but I rewired every thing.
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