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Installed the lights about 2 months ago & they worked fine. Switch turned them on with the low beams & off with the high. Then a couple of weeks ago the push/pull switch fell apart (cheap Chinese crap). Changed out the switch, no lights. Changed out the relay, now I have one fog light on all the time. Replaced the fuse at the power side & checked the ground. Even tried another set of fog lamps. What am I missing.
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Installed the lights about 2 months ago & they worked fine. Switch turned them on with the low beams & off with the high. Then a couple of weeks ago the push/pull switch fell apart (cheap Chinese crap). Changed out the switch, no lights. Changed out the relay, now I have one fog light on all the time. Replaced the fuse at the power side & checked the ground. Even tried another set of fog lamps. What am I missing.
Jeff, I have wired my car differently than you described, so my solution will not work for you. I independently fused my Hellas, at 16 amps each (photo, below). I am not making full use of all the slots in my fuse block, so it was easy for me.

For ease in identifying what's what, I decided to make every "hot" wire in the split to the fuse block red. Hot wires going to switches first are also red. The colors change after the fuse or after the switch, depending. I only have a small handful of independently powered items, so everything is also color-coded with a consistent wire color from the block to the load; the orange and green wires here are my fog lights, while the thick white is my headlights. The twisted white wires are my front turn indicators ... et cetera.

Here, though, is the best, simplest diagram I could find to do what you need to do, describing the wiring for a 914's fog lights.
Since you indicated the need for the lights to be switched automatically with the changeover to high-beams, this diagram indicates the fog lights will stay on with the headlights, but a switch to high-beams will kill them.
This diagram shows a VW fuse block, not a shocker, and appears to omit the 13mm bolt in the block used for grounding purposes.
The black wire with the blue stripe is the one to pay attention to.
I hope this helps:

http://members.rennlist.com/gman/porsche/foglight_wiring/page2.jpg

As long as you haven't changed the physical routing of the wires from the way they were when they were working, I figure you probably just needed the lineup of the component pieces in their ideal order; maybe just to help you focus on the parts affected.
If you need a new-ish switch, or at least a good-quality OEM one you can re-knob, 914 parts are pretty much free. I think they give them away in Cracker Jack boxes, as a matter of fact.
The whole writeup, posted by the Rennlist folks on their site, was originally published in Porsche Panorama in June of 1989. That article lives here:

http://members.rennlist.com/gman/porsche/foglight_wiring/

Good luck!

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