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Join Date: Jun 2002
Posts: 228
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H4 adding relay...where/how?
My mechanic is stuck on where & how the single relay should be installed to protect high beam swicth from overloaded by 55/100W H4s. This relay is recomended by several sources and a number of threads, but I cannot locate any instructions on how to wire it up or where it should be installed. Link to tech article or basic tip very much appreciated. Car in the shop as I write this.
Ted in rainy Fla 86 Carrera Blk/Blk 
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07-11-2002, 07:38 AM
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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,491
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This thread should answer your questions: Hella H4 conversions ?
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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07-11-2002, 07:48 AM
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Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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Some additional reading ...
Do you have to wire in a relay when putting H4's or 5's ia a SC?? Headlight Relays
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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07-11-2002, 08:42 AM
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Thanks for the link Kurt,
The most detailed post, however talks about a '72. The pelican part description calls the relay "upgraded" which implies a straight repalcement. The Pelican tech artical on Headlight upgrade is temp missing. The H4s have been in for awhile but I'm leary of leaving the 100W hi beams on for very long. Cheers Ted in semi sunny So Fla 86 Carrera
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07-11-2002, 08:45 AM
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Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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Ted,
There needs to be two relays and new fuses or circuit breakers, at the minimum! The convenient place to pick up the signal to operate the relays is the fuse block, one of which is provided for each filament in the headlamps. If he wires a relay coil to one high beam fuse and one coil relay to one low beam fuse ... your control stalk will be protected from overload!
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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07-11-2002, 08:55 AM
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Join Date: Dec 2000
Location: McLean, VA
Posts: 1,155
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Ted,
This link shows the location and some details of the install. http://members.rennlist.com/msucro1/relaykit.htm Note that he also sells a pre-wired relay kit for this mod, which is very handy. As others have said, its important to control both high and low beams via the relay. You want nothing more than switching current running through the stalk switch [weld a couple and you be be a believer!]. It also a good idea to upgrade the wire gauge from the fuse block to the headlight connector - those 100W flamethrowers pull a LOT more amps than the stock wiring was designed to carry.
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Tony K '89 944T 944 SuperCup Champ 2004 & 2005 '85 Carrera - Sold [sob] TrackVision 944Cup The 999 Site |
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07-11-2002, 09:16 AM
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Many thanks to everyone who responded...this board is incredible! Tony K, that looks like the answer.
Cheers Ted it's raining AGAIN in So. Fla 86 Carrera Targa Blk/Blk. PS another topic coming up, same garagae day..fuel gauge stuck even w/new sender.
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07-11-2002, 11:22 AM
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Headlight Relays
Ditto to TonyK..........I purchased the assembly from Marcus Sutro and the installation took all of one hour. Very handy to have the relays and wires preassembled. Came with clear instructions also.
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JB Noriel 82ChiffonSC IG @82_901sc |
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07-11-2002, 11:27 AM
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1982 Porsche 911SC 3.0L
