Last weekend, I installed the LH headlight bucket & globe and established a wiring harness incorporating a seperate relay & resettable 20Amp fusible link for each (high and low beam) circuit. I am really happy with the H4 Halogen glass lens units I found online, they have curved fronts and are patterned not unlike original sealed beam units:
Here’s the box in case anyone is looking for them, I highly recommend:
The only (very minor) issue I found was that once the two halves of the headlight retaining ring were brought together, it was loose, so the lens rattled. I hammered each corner of the three locating slots out to close this gap and then added bits of high temp vacuum hose from a SAAB turbo dump valve, so it all sits nice and snug. Also popped in a grommet where the unused parker light globe was:
The wiring harness I bought was from a mob called something like ‘65 Mustang Restorations’ and I got this one for a couple of reasons: it uses high quality ceramic H4 headlight plugs, the wiring itself is heavy gauge with the chunky insulation, and the whole harness including relays, fuse and power/earth straps worked out to be a pretty reasonable price, compared to buying it all in parts. I knew I was going to modify it, but I’ve used pretty much everything from it and I’m happy with the results.
Plugged it in for a quick test, immediately saw how much better it is
After looking at the way my bought harness was piggybacked to use a single-blow fuse and a single cable for both power and earth across both beams, I decided to unpick it all and re-configure relays so I wound up with the following circuit, with a seperate power wire and auto resetting fuse to each relay:
Here’s the finished harness:
This harness places the relays right next to the positive terminal of the battery, mounted to the back of the battery heat shield, pretty much out of sight when you open the bonnet. Getting photos of it was hard enough... the fuses are staggered right above this and the power leads are only 10cm long for minimal voltage drop. I curved and heat-shrunk the harness to run under the battery tray to the front, where it meets the headlight distribution block, feeds the LH headlight and sends wiring for the RH headlight off through the rad support panel, along with horn/LH Parker & indicator wires. I’ll run the RH headlight cables inside the grille support brace to the other side eventually...
Excuse the poorly lit photos:
with the red plastic fuse covers in place:
It looks kind of messy, but I was hoping to retain the original look of that big old ugly distribution block. I might reconfigure and use a different/better earth point to eliminate a couple of those wires... but it looks pretty good in real life, ie: when you’re not shining an LED trouble light on it all
Anyways, I’m bloody stoked at how well it works. And we’re up to date. Back to work!
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