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When the bulb-out relay triggers, it passes current through a 1.2W bulb - and its internal switch is probably rated for about this amount...not the 110W of a pair of fog lamps.
You can salvage Hella 30-amp relays from many Euro cars in the PnP, or brand new Bosch (or clones) automotive relays are available from Jameco.com or Partsexpress.com for less than $3. Order the relay sockets at the same time and cut down on your wiring hassles.
A 16-page booklet on wiring Bosch-type relays for a multitude of purposes is available here:
http://www.partsexpress.com/pdf/500-001.pdf
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Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar 77 MGB, and a few old motorcycles)
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