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Registered
Join Date: Aug 2006
Location: Washington D.C.
Posts: 4
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1985 930 Electrical Issues
Last night when driving home something happened that I need to track down. My highbeams popped, my parking lamps perished, and I was left with only low beams to make it home. When I got home, I went to check the fuses under the hood and heard my optima battery hissing. It was extremely hot. As if it was overcharging. Before I go and tear this system down looking in every direction, does anyone have a good idea where to start or what may be the cause of this? Any help would be greatly appreciated.
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08-26-2006, 11:14 AM
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Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,431
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voltage regulator bizerk. just get a fresh alt/reg unit and replace the old one.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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08-26-2006, 11:16 AM
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Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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JW already gave you the solution, but I would like to suggest that you install an expanded scale Voltmeter so you will be able to track your system Voltage and be better informed of problems as they occur. Pelican has a very good VDO Cockpit series expanded-scale Voltmeter.
You will probably need to replace the Optima battery ... there is a warning/caution about charging them above 15.5 Volts at the Optima web site.
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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08-26-2006, 12:01 PM
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Join Date: Aug 2006
Location: Washington D.C.
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I was told that this may also be a grounding issue? I know it was a votage regulator issue, I just didnt know if other causes may be attributable. The car battery intermitantly discharges overnight prior to this mishap. Sometimes it would happen, others it would not. I think there may be more to this story and wanted to know of others that may have heard or have had similar electrical issues. Thanks.
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08-26-2006, 12:38 PM
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Join Date: Aug 2006
Location: Washington D.C.
Posts: 4
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Bump! Bump!
Last edited by Paragon; 08-27-2006 at 08:23 AM.. |
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08-26-2006, 04:36 PM
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Join Date: Aug 2006
Location: Washington D.C.
Posts: 4
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Big Old Bump!
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08-27-2006, 08:23 AM
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Registered
Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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While I have no doubt that grounding issues are possible, they would tend to cause low output Voltage, rather than high. If a Voltage regulator 'sees' a higher-than-normal' Voltage drop because of a high-resistance ground, then the battery would 'see' a lower-than-normal applied Voltage, not 18 Volt++ cooking levels.
It would certainly be a good idea to clean up the battery posts, grund strap connections in the trunk, body-to-transaxle, and engine compartment ... before the new alternator is tested!
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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08-27-2006, 08:38 AM
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Registered
Join Date: Aug 2002
Location: Galivants Ferry, SC
Posts: 10,550
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Warren.....
what would constitute an "expanded scale" voltage meter as opposed to regular scale??? 8V-16V ... ???? - Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) Last edited by Wil Ferch; 09-03-2006 at 10:40 AM.. |
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09-03-2006, 10:34 AM
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