 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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Advanced Member  Group: Members Posts: 3,737 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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| Mikey914 |
Feb 10 2021, 03:06 PM
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The rubber man Group: Members Posts: 12,772 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None
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Also, if your bulb for the alternator doesn't light up when you turn the key (or you have replaced with an LED) it will not get the small charge necessary to excite the field and allow it to charge.
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| flyer86d |
Feb 10 2021, 04:03 PM
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Member Group: Members Posts: 468 Joined: 12-January 11 From: Corea, Maine Member No.: 12,585 Region Association: North East States |
QUOTE(Mikey914 @ Feb 10 2021, 04:06 PM)  Also, if your bulb for the alternator doesn't light up when you turn the key (or you have replaced with an LED) it will not get the small charge necessary to excite the field and allow it to charge. Yes! One of the old Mercedes that I had mysteriously stopped charging. It was a 1981 280CE grey market car. I called the shop that rebuilt all of my starters and alternators and their first question was if the alternator light came on when the ignition was first turned. Guess what? The bulb was dead. I replaced it and the alternator began charging. Charlie |
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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 Hopefully this is it. Feb 10 2021, 04:19 PM Tdskip Thanks for all of the responses - the bulb works (... Feb 10 2021, 05:35 PM
Jonathan Livesay
Thanks for all of the responses - the bulb works ... Feb 10 2021, 07:59 PM stickyfingers
Thanks for all of the responses - the bulb works... Feb 23 2021, 11:17 AM ndfrigi
[quote name='Jonathan Livesay' post='2890148' dat... Feb 23 2021, 11:28 AM 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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