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Registered User
Join Date: Aug 2012
Posts: 2
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1979 porsche 911 lights
in need of some major help i have a 1979 porsche 911 and having problems with the electrics for the lights, i turn ignition on and have all lights but as soon as i start the engine i lose the high and low beam . this is very puzzling to me please help.
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08-16-2012, 05:54 AM
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Do your running lights come on and stay on after starting?
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Lillie - 1979 911 SC Targa, The Original 911 SCWDP Car. Currently in open heart surgery. |
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08-16-2012, 08:11 AM
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Perhaps a bad ground ?
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15 year PCA member  1972 911 E Coupe - gone now 1987 Mazda RX-7 2+2 - still cooking Swift DB-1 FF & Swift DB-3 F2000 -not forgotten 1979 911SC 3.0 & 2000 Camaro |
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08-16-2012, 10:43 AM
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Join Date: May 2011
Posts: 7,245
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What kind of headlights do you have? Sugar scoops, H4? Had the lights worked befor the new trouble. You may want to check the harness connectors that go into the light switch. I recently had the problem when I rebuilt my directional-low-high-beam swith at the left side of the steering wheel. When I reinstalled it the connector was lose and the lights did not turn on. I dove under the dashboard on my back and pushed it in safely. Also, do you have the after market headlight relays?
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79 SC Targa 72 T Targa Sold 68 T Coupe Sold 65 912 Coupe Sold 62 356B Coupe Sold Last edited by porwolf; 08-16-2012 at 10:51 AM.. |
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08-16-2012, 10:49 AM
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Join Date: Aug 2012
Posts: 47
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Hi, I suspect that your problem lies with the ign switch.
I assume that you switch on your headlights and leave them on....dont touch the h light sitch, start the car and the lights go off. If this is the case, the power for your headlights should come from the ign switch to your headlight switch, that is unless your wiring has been modified to incorporate a h light relay. If this is the situation you will need to locate the relay, and check where it gets its supply from....perhaps a fuse on the main board. Nonetheless, it still points to a power supply problem from the ign switch. If you can read a wiring diagram, pages 291-294 of the 911 Haynes manual should help..... E1 on page 294 is the headlight switch....D on page 294 is ign switch. It maybe a loose/ dirty connection on the ign or headlight switch when the engine is running , and it cannot cope with the extra current. If you get under the dash ...mirror or just contort your body, you will see several piggy back terminals which are a recipe for disaster, and probably a load of dirty terminals. Hope I may have been some help... If you live in Staffordshire I would look at it for you!! |
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08-16-2012, 10:41 PM
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Join Date: Aug 2012
Posts: 2
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thanks guys for your help have pinned it down to the ignition switch, i found that when starting the car i loose all power to not just lights but elec windows speedo etc so as long as i turn the key back a bit i get the electrics bk . passed mot now with one advisory on fr shock so happy days driving my childhood dream car
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08-27-2012, 12:41 PM
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Lillie
Molly
