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  #1  
Old 24-07-2017, 04:16 PM
Geoff-R Geoff-R is offline
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Sealed Beam to H4 Conversion Wiring

Hi all,

Just looking for a few pointers. I've removed the LHD old sealed units off my car and have a set of new H4 units. I'm wanting to wire them up but as I've read the H4 units will cook the original wiring without a new relay in place. Can anyone tell me where I can either purchase the conversion harness with relays etc or where I can buy the components in order to build my own conversion harness.

Cheers
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Old 24-07-2017, 05:28 PM
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uk66fastback uk66fastback is offline
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Here's one:

https://www.datsun-240z-upgrades.net/product-info/

If putting it together yourself here's a company good to deal with:

http://www.vehicle-wiring-products.eu
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Old 24-07-2017, 05:46 PM
Moriarty Moriarty is offline
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Or buy LED bulbs with a fraction of the current draw
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Old 24-07-2017, 09:49 PM
Geoff-R Geoff-R is offline
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Quote:
Originally Posted by uk66fastback View Post
Here's one:

https://www.datsun-240z-upgrades.net/product-info/

If putting it together yourself here's a company good to deal with:

http://www.vehicle-wiring-products.eu
Cheers mate, this is just what I was after!

Moriarty out of interest have you had experience of using led h4 bulbs?
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Old 25-07-2017, 01:28 AM
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the wiring is pretty simple to make your own but there are kits allready out there you can buy so you could allways chop the wiring and extend or shorten it as needed.
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Old 25-07-2017, 10:18 AM
Moriarty Moriarty is offline
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Quote:
Moriarty out of interest have you had experience of using led h4 bulbs?
Yes I have them fitted
Simple plug and play, they take a fraction of the current, run way cooler and produce a strong white light, plus the kits usually come with optional filters to change this, if that's your thing.

Not cheap at 10 - 15 per bulb but you wont have to modify anything plus you'll never have to buy a bulb again
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Old 25-07-2017, 11:46 AM
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Jon_Flynn Jon_Flynn is offline
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Quote:
Originally Posted by Moriarty View Post
Yes I have them fitted

Simple plug and play, they take a fraction of the current, run way cooler and produce a strong white light, plus the kits usually come with optional filters to change this, if that's your thing.



Not cheap at 10 - 15 per bulb but you wont have to modify anything plus you'll never have to buy a bulb again


And these just replace the stock bulbs with no other wiring needed?

Got a link? Could be a worthwhile upgrade rather than changing the lighting setup in full


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Old 25-07-2017, 03:14 PM
Geoff-R Geoff-R is offline
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Quote:
Originally Posted by Jimbo View Post
the wiring is pretty simple to make your own but there are kits allready out there you can buy so you could allways chop the wiring and extend or shorten it as needed.
I think I would make it myself as the cost of a kit Vs an hour or so of my time to make it would be worthwhile.

Moriarty, pop up some pictures if you can, that would be useful to see, cheers
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Old 25-07-2017, 05:49 PM
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That's fair enough, I think the last ready wired kits I saw were on eBay for about 35
When I made my own there wasn't much in it price wise but I know mines better quality😉


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Old 25-07-2017, 10:24 PM
Geoff-R Geoff-R is offline
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Quote:
Originally Posted by Jimbo View Post
That's fair enough, I think the last ready wired kits I saw were on eBay for about 35
When I made my own there wasn't much in it price wise but I know mines better quality😉


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That's it, if you make it you know how well it's been made. Out of interest what amp relays did you use?
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Old 25-07-2017, 11:11 PM
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40amp with built in fuse holder for the main live input
Used to be able to get them from halfords


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Old 25-07-2017, 11:20 PM
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You can still get them on eBay for 5
A 30amp on will do fine
A h4 bulb is 55 watt low beam and 60 high beam
55 devided by 12 is 4.6 amp x 2 is near enough 10 amp so the one relay for low beam will have no issue
60 devided by 12 is 5 amp so x2 is 10 amp again so the current to light both dipped and main isn't going to be much more than 10 amp so standard 30 amp relay will be fine


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Old 25-07-2017, 11:21 PM
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Just make sure you fuse it well as close as you can to the battery you don't want a short


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Old 26-07-2017, 10:12 AM
Moriarty Moriarty is offline
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Quote:
And these just replace the stock bulbs with no other wiring needed?

Got a link? Could be a worthwhile upgrade rather than changing the lighting setup in full
Just Google LED H4 bulb....... pages and pages will result

Quote:
Moriarty, pop up some pictures if you can, that would be useful to see, cheers
Just exactly what should I show a picture of ?

Two options

1. Spend cash/time on a bespoke loom/relays and then debug and with due respect few people on here have decent practical skills plus you're still left with a filament bulb that that takes significant current .............or

2. Spend 30 on bulbs and plug them in.

Horse, water, lead
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Old 26-07-2017, 11:19 AM
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Rob Gaskin Rob Gaskin is offline
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Had this through the post recently, it might help understanding:
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