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H4 socket wires to US Headlight wiring
http://www.teamswift.net/viewtopic.php?f=12&t=62184
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Author:  Swift sensation [ Thu Dec 15, 2016 11:53 am ]
Post subject:  H4 socket wires to US Headlight wiring

I bought some glass headlights for my 89 GTI. I just need to know how to wire the h4 sockets! The wires on the socket are blue, red, and black! What wires do they connect to on the US headlight wiring?

Author:  blueturbofly [ Thu Dec 15, 2016 2:35 pm ]
Post subject:  Re: H4 socket wires to US Headlight wiring

there will be 2 SWITCHED negative leads, white/blue tracer and white/red tracer (one being low beam, the other high beam) and the red/blue (or black ) tracer is CONSTANT POSITIVE.

on the h4 socket the BLACK lead is constant positive, the other two, one for high beam, the other low beam, switched negative.

now would be the time to do the relay mod. makes for brighter lights, and less chance for burnt wires in the fuse block.

Author:  Swift sensation [ Thu Dec 15, 2016 10:37 pm ]
Post subject:  Re: H4 socket wires to US Headlight wiring

What's the relay mod?

Author:  blueturbofly [ Fri Dec 16, 2016 9:03 am ]
Post subject:  Re: H4 socket wires to US Headlight wiring

using the existing wiring, then adding 2 extra relays to the circuit, changing it from switched negative to switched positive.

you can use 4 pole or 5 pole 40 amp relays. one for low beams, the other for high beams.

terminal 86 on relay connects to red hot wire on car headlight circuit.
terminal 87 on relay connects to fused power (+) from battery, 20 amp inline fuse recommended.
terminal 85 on relay connects to negative (-) switched power from car (either high or low lead, not both!)
terminal 30 on relay connects to positive (+) on h4 socket (blue or red, in your case) run two leads off of this terminal, one lead for each head lamp.
black lead on your h4 socket is now ground.

do the same for the other relay, but use the OTHER switched negative (-) lead from the car to terminal 85
then terminal 30 connects to positive (+) on the h4 socket (blue or red)

one relay is now positive (+) switched for low beams, the other relay is switched positive (+) for the high beams.
use the factory power (red positive (+) constant) on both sides of the car, one factory lead going to one relay (terminal 86), the other factory lead to the other relay (terminal 86)- that way you don't lose ALL your headlights if it blows the factory fuse.
on the h4 sockets, I am not sure which lead (blue or red) are for low or high beams. but the black will be ground. it will take some testing to ensure correct low/ high beam operations.
there might be diagrams of the mod on teamswift somewhere.....

Author:  RP91gt [ Fri Dec 16, 2016 9:29 pm ]
Post subject:  Re: H4 socket wires to US Headlight wiring

just buy the H4 connectors and splice spade connectors to you're factory harness.

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