Voltage Problem and Hot Regulator |
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Voltage Problem and Hot Regulator |
Ansbacher |
Jul 16 2016, 06:45 PM
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#1
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Senior Member Group: Members Posts: 689 Joined: 4-July 14 From: Tampa Bay, Florida Member No.: 17,589 |
Car is a '74 2.0L
Driving along the beach road this evening I noticed my center console volt meter reading about 12V. Thought it was normal as I had the lights on however, further along it started to drop even more and by the time I stopped at a light it was near 10V. The charge idiot light never illuminated. So, checked the ALT belt - good tension Battery engine off - 12.2 V Battery engine running at idle - 13.5 V (used a hand-held VOM) Then I touched the case of the voltage regulator - EXTREMELY hot. Hotter than anything else in the engine compartment. Do I have a bad voltage regulator? Can something else cause a voltage regulator to overheat? Don't know how old the regulator is, but it looks old. Alternator replaced one year ago. Center console volt meter less than 3 months old and has been displaying normal readings until now. Input appreciated. Ansbacher Seminole, Florida |
worn |
Jul 16 2016, 07:33 PM
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#2
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can't remember Group: Members Posts: 3,154 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest |
Car is a '74 2.0L Driving along the beach road this evening I noticed my center console volt meter reading about 12V. Thought it was normal as I had the lights on however, further along it started to drop even more and by the time I stopped at a light it was near 10V. The charge idiot light never illuminated. So, checked the ALT belt - good tension Battery engine off - 12.2 V Battery engine running at idle - 13.5 V (used a hand-held VOM) Then I touched the case of the voltage regulator - EXTREMELY hot. Hotter than anything else in the engine compartment. Do I have a bad voltage regulator? Can something else cause a voltage regulator to overheat? Don't know how old the regulator is, but it looks old. Alternator replaced one year ago. Center console volt meter less than 3 months old and has been displaying normal readings until now. Input appreciated. Ansbacher Seminole, Florida Not sure about normal. Probably a regulator gone bad. My experience has been that it is common for new regulators to under deliver under load. It seems it is trial and error. Once the headlights are on the regulator sometimes has trouble keeping up. Evenentually I went with an adjustable regulator. In your case I hope a new one will do. Check out the pelican site for a nice diagnostic to evaate alternator vs regulator. It is in the 911 area. |
914Sixer |
Jul 16 2016, 09:28 PM
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#3
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
Stock Bosch or Aftermarket?
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Ansbacher |
Jul 16 2016, 10:34 PM
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#4
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Senior Member Group: Members Posts: 689 Joined: 4-July 14 From: Tampa Bay, Florida Member No.: 17,589 |
Mine that got hot is a Bosch Number - 0 190 601 006 but it says Made in Brasil.
Ansbacher |
jim_hoyland |
Jul 17 2016, 11:22 AM
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#5
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Get that VIN ? Group: Members Posts: 9,288 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California |
[/quote] Not sure about normal. Probably a regulator gone bad. My experience has been that it is common for new regulators to under deliver under load. It seems it is trial and error. Once the headlights are on the regulator sometimes has trouble keeping up. Evenentually I went with an adjustable regulator. In your case I hope a new one will do. Check out the pelican site for a nice diagnostic to evaate alternator vs regulator. It is in the 911 area. [/quote] Any tips when installing the adjustable VR ? Just ordered one from Dave's |
Darren C |
Jul 17 2016, 12:48 PM
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#6
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Member Group: Members Posts: 392 Joined: 26-December 14 From: Chichester UK Member No.: 18,255 Region Association: England |
I had the same with my original Bosch regulator. Voltage dropped off to the point that when I pressed the brake pedal the brake lights came on and the voltage dropped around 9V and engine stalled.
I discovered that the regulator casing was VERY hot, too hot to touch. I got a new Beru one that was 1/4 the price of a Bosch unit. Slightly shorter on height (which makes fitting the relay board cover much easier on a 74 car) It's solid state modern inners so runs stone cold to the touch. They're common to the VW T2 bus (with Type IV engine) so you can purchase them at most VW suppliers. or off ebay http://www.ebay.com/itm/BMW-E10-1600-2002-...dae&vxp=mtr As regards tips on fitting... Just two tiny screws in the side and it pulls up and out. Plug and play. |
Ansbacher |
Jul 17 2016, 03:27 PM
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#7
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Senior Member Group: Members Posts: 689 Joined: 4-July 14 From: Tampa Bay, Florida Member No.: 17,589 |
Darren C - Thanks for confirming my problem! I have ordered a new VR today.
Ansbacher I had the same with my original Bosch regulator. Voltage dropped off to the point that when I pressed the brake pedal the brake lights came on and the voltage dropped around 9V and engine stalled. I discovered that the regulator casing was VERY hot, too hot to touch. I got a new Beru one that was 1/4 the price of a Bosch unit. Slightly shorter on height (which makes fitting the relay board cover much easier on a 74 car) It's solid state modern inners so runs stone cold to the touch. They're common to the VW T2 bus (with Type IV engine) so you can purchase them at most VW suppliers. or off ebay http://www.ebay.com/itm/BMW-E10-1600-2002-...dae&vxp=mtr As regards tips on fitting... Just two tiny screws in the side and it pulls up and out. Plug and play. |
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