E30 H4 lighting conversion

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E30 H4 lighting conversion

Postby alan1272 » Thu Dec 01, 2011 8:38 pm

right, i'm determined to have another bash at some road rallys but before i do i'm going to try and sort all the niggly things with the car. one of the main problems i had was seeing where i was going as the E30 can only use the standard light set up, or sacrifice the inner hi beams for a set of spots.

to comply with the rules yet give myself more light i need to convert the outers to H4 so i can have lo and hi beam in one lense and the spots separate (like a mk2 escort or golf).

i will use a set of 5.75inch generic H4 headlight units, which is the easy part.
the wiring is giving me a bit of a headache however :?
i'm guessing that the lo and hi beams in the h4 bulb cannot be on at the same time otherwise the excessive heat will lead to them failing prematurely and will put a lot of load on the altenator :?:

i've done a bit of googling and found some wiring diagrams that may work and so ive stolen and modified one for an idea as to what i intend to do for the wiring harness.

this way when the hi beams are turned on the low beams should switch off, yeah?
(where it says "from switch or bucket, i'll take a feed from the factory wiring for the respective lamp. in the case of the hi beams i'll have two feeds coming from it becasue the spotlight relay already takes a signal from it; but as they are only signals to the relays and therefore not drawing much current i assume they'll be ok?)

Image

any wiring guru's able to advise me on this?
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alan1272
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Re: E30 H4 lighting conversion

Postby alan1272 » Thu Dec 01, 2011 8:51 pm

actually, i've just thought that i hadn't put a relay in for the low beams there
Image
this one any better?

(EDIT* forum chopping the pic down so here's the direct link http://img.photobucket.com/albums/v303/ ... rsion2.jpg )
Image
alan1272
BMW Obsessed
BMW Obsessed
 
Posts: 559
Joined: Mon Nov 05, 2007 4:48 pm
Location: dyserth, north wales


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