Upgrading headlight harness

I have already replaced the bulbs in my 164 with high quality philips halogens but I'm looking to go a bit further.

I am contemplating replacing the headlight harness so that more power goes to the bulbs. Checking the voltages with the engine on fast idle it seems there's about a one volt drop between the battery and the headlight connector. Battery is 13.75 v, low beam is 12.75v and high beam is 12.5.

Has anyone used any of the pre-assembled relay harnesses from Ebay or Amazon?

Better to build my own?


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