 Drop some knowledge: what external faults would prevent an alternator from charging? |
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| Tdskip |
 Feb 10 2021, 01:10 PM
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#1
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Advanced Member  Group: Members Posts: 3,686 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None 
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The 1975 is not recharging the battery, so I obviously have either a fault with the alternator or the wiring/charging circuit.
In the interest of being just slightly less of a dope than I currently am, what would cause the charging circuit to fail if it is not an internal alternator issue. In other words, if we assume that the alternator is healthy and there’s no issues with the brushes etc. internal to the alternator wear with the wiring I have gone sideways to result in it not charging? This seems like a useful topic to get into the forum here, thanks in advance for the shared knowledge. |
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| Tdskip |
Feb 10 2021, 05:35 PM
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#2
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Advanced Member Group: Members Posts: 3,686 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None
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Thanks for all of the responses - the bulb works (glows with key on and when running).
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| Jonathan Livesay |
Feb 10 2021, 07:59 PM
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#3
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Senior Member Group: Members Posts: 741 Joined: 13-March 10 From: La Canada CA Member No.: 11,461 Region Association: None
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QUOTE(Tdskip @ Feb 10 2021, 03:35 PM)  Thanks for all of the responses - the bulb works (glows with key on and when running). And it's not an LED bulb? |
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| stickyfingers |
Feb 23 2021, 11:17 AM
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#4
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Member Group: Members Posts: 168 Joined: 19-February 21 From: Toronto Member No.: 25,223 Region Association: Canada |
QUOTE(Jonathan Livesay @ Feb 10 2021, 08:59 PM) QUOTE(Tdskip @ Feb 10 2021, 03:35 PM) Thanks for all of the responses - the bulb works (glows with key on and when running). And it's not an LED bulb? Not to hijack the thread but wanted to state that I'm having a similar issue. The alternator light is ON when in accessory mode or with the car started. I'm going to remove the voltage regulator (if anyone can give me a quick location of that it would be great - waiting for my 914 shop manual to arrive - total noob here). Hoping it maybe the voltage regulator. The light wasn't on 2 weeks ago (it got shipped from BC over 3000+ Km to Ontario) as per the previous owner. Not sure if something came loose in transit. I've attached my charger that tests the alternator which says its fine. So I'm hoping its the voltage regulator that's bad. |
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| ndfrigi |
Feb 23 2021, 11:28 AM
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#5
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Advanced Member Group: Members Posts: 2,928 Joined: 21-August 11 From: Orange County Member No.: 13,474 Region Association: Southern California
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QUOTE(stickyfingers @ Feb 23 2021, 09:17 AM) QUOTE(Jonathan Livesay @ Feb 10 2021, 08:59 PM) QUOTE(Tdskip @ Feb 10 2021, 03:35 PM) Thanks for all of the responses - the bulb works (glows with key on and when running). And it's not an LED bulb? Not to hijack the thread but wanted to state that I'm having a similar issue. The alternator light is ON when in accessory mode or with the car started. I'm going to remove the voltage regulator (if anyone can give me a quick location of that it would be great - waiting for my 914 shop manual to arrive - total noob here). Hoping it maybe the voltage regulator. The light wasn't on 2 weeks ago (it got shipped from BC over 3000+ Km to Ontario) as per the previous owner. Not sure if something came loose in transit. I've attached my charger that tests the alternator which says its fine. So I'm hoping its the voltage regulator that's bad. engine bay driver side at the relay board  |
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Posts in this topic
Tdskip Drop some knowledge: what external faults would prevent an alternator from charging? Feb 10 2021, 01:10 PM
Jonathan Livesay
The 1975 is not recharging the battery, so I obvi... Feb 10 2021, 01:16 PM ClayPerrine Do a full field test on the alternator.
With the ... Feb 10 2021, 01:29 PM VaccaRabite Grounds. Check them. Clean them.
Even a small gr... Feb 10 2021, 02:45 PM Mikey914 Also, if your bulb for the alternator doesn't ... Feb 10 2021, 03:06 PM
flyer86d
Also, if your bulb for the alternator doesn't... Feb 10 2021, 04:03 PM Mikey914 Hopefully this is it. Feb 10 2021, 04:19 PM Mark Henry
[quote name='Jonathan Livesay' post='2890148' dat... Feb 23 2021, 01:09 PM Tdskip Highjack away if it helps, no worries.
My dash li... Feb 23 2021, 11:50 AM rick 918-S Possibly a bad relay board. Clays test may rule th... Feb 23 2021, 12:26 PM Spoke You can do a rudimentary test on the alternator th... Feb 24 2021, 05:41 AM rgalla9146 All great advise.
Do these basic checks as we... Feb 24 2021, 06:30 AM mate914 I was going to say grounds... also.
How about a ... Feb 24 2021, 06:38 AM Tdskip Hi folks – just wanted to close this out. Turns ... Mar 11 2021, 03:42 PM |
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