 Battery Charging System, Battery not charging |
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| Schmaz356 |
 Apr 20 2023, 10:46 AM
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#1
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Newbie  Group: Members Posts: 9 Joined: 4-November 21 From: Michigan Member No.: 26,054 Region Association: Upper MidWest  |
I am building a 914-6 and I have an issue where the battery does not charge. Basically everything is new on the car (alternator, voltage regulator, battery & cables). The car runs fine but just will not charge the battery. I have checked the grounds on the body and at the transmission. The belt seems fine and is new. I pulled the battery and the regulator and brought it to a shop where they said it was putting out 14.2V using my regulator.
My Alternator wires are as follows; Red from B+ to Starter Black from DF to DF on the Regulator Brown from D- to D- on Regulator Blue from D+ to D+ on Regulator and then to the Dash Battery Light. (which is on all of the time) Ground from D- to engine case. When I put the system back together, I checked the continuity of each cable to assure myself it wasn't just a pulled connector or broken wire. When the car is running and reved to 2,000 RPM I still only get battery voltage. Please help with any thoughts on what I should check next. Thanks. |
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| davep |
Apr 21 2023, 08:38 AM
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#2
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914 Historian Group: Benefactors Posts: 5,262 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada  |
The alternator light in the instrument CANNOT be an LED; filament bulb as original only. LED will not allow charging system to work!
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| StarBear |
Apr 21 2023, 08:45 AM
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#3
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Advanced Member Group: Members Posts: 2,120 Joined: 2-September 09 From: NJ Member No.: 10,753 Region Association: North East States 
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QUOTE(davep @ Apr 21 2023, 10:38 AM)  The alternator light in the instrument CANNOT be an LED; filament bulb as original only. LED will not allow charging system to work! (IMG:style_emoticons/default/agree.gif) (IMG:style_emoticons/default/biggrin.gif) |
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| ClayPerrine |
Apr 21 2023, 10:46 AM
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#4
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Life's been good to me so far..... Group: Admin Posts: 16,319 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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QUOTE(StarBear @ Apr 21 2023, 09:45 AM) QUOTE(davep @ Apr 21 2023, 10:38 AM) The alternator light in the instrument CANNOT be an LED; filament bulb as original only. LED will not allow charging system to work! (IMG:style_emoticons/default/agree.gif) (IMG:style_emoticons/default/biggrin.gif) This is how it works: There is a circuit in the alternator to control the charging system warning lamp that is on the dash. Part of that circuit is a set of diodes mounted inside the alternator called the diode trio. The diode trio takes current coming from the three stator windings and passes a small amount through three diodes so that only the positive voltage comes through. After the diodes, the wires are joined into one wire and sent out of the alternator over the blue wire. It then goes to one side of the dash warning lamp that is used to tell you when there is a problem with the charging system. The other side of the lamp is connected to the run side of the ignition switch. If both sides of the warning lamp have equal positive voltage, the lamp will not light. Remove voltage from one side and the lamp comes on to let you know there is a problem. On a 914, the bulb must be an original 12 volt, 4watt incandescent bulb. An LED won't work due to the way the circuit is built. Put an old light bulb back in the lamp and I will bet your alternator starts working again. |
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| Spoke |
Apr 21 2023, 11:34 AM
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#5
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Jerry Group: Members Posts: 7,158 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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QUOTE(ClayPerrine @ Apr 21 2023, 12:46 PM) On a 914, the bulb must be an original 12 volt, 4watt incandescent bulb. An LED won't work due to the way the circuit is built. @ClayPerrine I recall some threads on Pelican where there was a resistor added in parallel with the bulb because the bulb current wasn't enough for the alternator to bootstrap itself and turn on. I don't think it was all years 911's. |
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Posts in this topic
Schmaz356 Battery Charging System Apr 20 2023, 10:46 AM
windforfun Try a different voltage regulator. It should be p... Apr 20 2023, 11:09 AM
porschetub
Try a different voltage regulator. It should be ... Apr 20 2023, 07:56 PM Schmaz356 Thanks for the input. One other thought. I read on... Apr 21 2023, 06:17 AM ClayPerrine
[quote name='ClayPerrine' post='3072832' date='Ap... Apr 21 2023, 11:48 AM Spoke
I am building a 914-6 and I have an issue where t... Apr 21 2023, 10:25 AM dr914@autoatlanta.com do you have a replacement alternator with a built ... Apr 21 2023, 11:04 AM Schmaz356 Thanks to everyone. The issue was the fact I used ... Apr 22 2023, 09:14 AM brant You have to put a one way resistor into circuit
W... Apr 22 2023, 09:41 AM Superhawk996
You have to put a one way resistor into circuit
... Apr 22 2023, 10:40 AM brant Here is our racecar wiring Apr 22 2023, 10:38 AM brant Correct. Diode
Old man’s disease
Plus I really ... Apr 22 2023, 10:43 AM Schmaz356 When I saw the symbol I knew it was a diode. Thank... Apr 23 2023, 06:49 AM Schmaz356 Brant;
One more question.
I installed the diode li... Apr 24 2023, 09:17 AM brant I don't know...
thought that the light would ... Apr 24 2023, 09:23 AM Schmaz356 Brant;
One more question.
I installed the diode li... Apr 24 2023, 09:57 AM Schmaz356 Okay, Thanks. Apr 24 2023, 09:58 AM |
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