Lights SC

[macssc911]

Hey all, driving home tonight after PCA dinner, flipped on brights on headlights all dark out there. 1982 SC Thank goodness low beams working. I do have H4s and proper light relay for H4s Will dig into it this week any thoughts on where to start I have meters and all I need to troubleshoot. Thought maybe someone could take me right to the issue
Thanks in advance
Mac

[timmy2]

If removable type, swap the relays from high to low to see if it moves with the relay first.
Then look for the turn signal quick fix thread if it doesn’t.

[F1LOCO]

Relay swap is the quickest way to start trouble shooting. Then check voltage coming out of the switch that feeds them, followed a painful and slow check of the grounds.
I made the leap to LEDs and can't be happier. No relays to worry about, plug/play and did I say bright? Didn't think it was possible to have functioning lights on our old SCs. Looking at getting another pair for my '64 TR4.

https://www.lasfit.com/collections/h4/products/ls-plus-series-9003-h4-led-headlight-bulbs

[Mr. Merk]

Originally Posted by F1LOCO

I made the leap to LEDs and can't be happier. No relays to worry about, plug/play and did I say bright? Didn't think it was possible to have functioning lights on our old SCs. Looking at getting another pair for my '64 TR4.

https://www.lasfit.com/collections/h4/products/ls-plus-series-9003-h4-led-headlight-bulbs

This is a modification, but not an upgrade.

Properly aiming your H4s is step one, and the most important step.

If you're trying to get the most out of your H4 setup, get a pair of these 60/55W Tungsram +120 bulbs from Daniel Stern Lighting.

If you're using sugar scoops and want to maintain a period-correct look, Stern can also get you Koito euro H4 7" lamps which are the best halogen lamp money can buy.

If you care more about night-time vision, the JW Speaker 7" LED lamp is the best on the market, but it just plain looks wrong on a 911 (and has to be used with Sugar Scoops or Audette style.

[darrin]

Two thoughts

1) start by checking the fuses - as high beams are controlled/fused by a different circuit than low beams. If fuses all check out, then look at relays

2) to add to Mr. Merk's post -- another issue/concern with putting LED bulbs into H4 headlight assemblies (that were designed to use halogen bulbs) is that the incandescent (Halogen) bulb produces all of its light from a single point, while the LED substitute produces light from several modules spaced along its shaft (see the picture in the link F1LOCO posted). Since the H4 reflector/assembly was designed to focus light from the single point source halogen bulb, using a LED substitute will invariably compromise the accuracy of the H4 reflector/assembly, resulting in what may appear to be "brighter" light that's not contained/controlled by the h4 assembly in the same manner as a "real" H4 halogen bulb (and that can therefore distract oncoming cars, etc.)

[macssc911]

Thanks to all, great information