Bosch Spot and Fog

arcturus · Mar 21st, 2015, 15:29

Picked these up for PV recently,old style Bosch spot and fog lamps. Just need to find some 6 volt H3 halogen light bulbs and then figure out the best way to mount them!

arcturus · Aug 18th, 2015, 17:57

Although I've had them mounted a while i never got round to wiring them. I have a switch and a pair of 6 volt relays. What gauge cable should I use?

SwallownAmazon · Aug 19th, 2015, 10:27

On the "output" side of the relay and the fused power supply to it, use the heaviest cable you can find - ammeter cable is fine. You need greater capacity because the current carried will be at least double that for 12v lights.

Ron Kwas · Aug 19th, 2015, 12:21

Arcturus;

Calculate expected circuit Current from Wattage rating of lamp element: I = P/V , then look up minimum recommended wire gauge/cm2 on a chart such as found here: http://www.engineeringtoolbox.com/wi...ges-d_419.html

Remember to consider the entire circuit current path, to assure it is capable of safety passing the load current.

Spot and Fog Lights should be on separate circuits, with separate controls because you never want them on at the same time.

Cheers

Aug 18th, 2015, 17:57	#2
arcturus arcturus Last Online: Today 07:14 Join Date: Mar 2006 Location: Sagres Portugal	Although I've had them mounted a while i never got round to wiring them. I have a switch and a pair of 6 volt relays. What gauge cable should I use? __________________ life's too short to drink bad wine

Aug 19th, 2015, 10:27	#3
SwallownAmazon Member Last Online: Oct 29th, 2019 23:10 Join Date: Aug 2015 Location: Tonbridge	On the "output" side of the relay and the fused power supply to it, use the heaviest cable you can find - ammeter cable is fine. You need greater capacity because the current carried will be at least double that for 12v lights.

Aug 19th, 2015, 12:21	#4
Ron Kwas Premier Member Last Online: Today 00:51 Join Date: Jul 2007 Location: Connecticut, USA	Arcturus; Calculate expected circuit Current from Wattage rating of lamp element: I = P/V , then look up minimum recommended wire gauge/cm2 on a chart such as found here: http://www.engineeringtoolbox.com/wi...ges-d_419.html Remember to consider the entire circuit current path, to assure it is capable of safety passing the load current. Spot and Fog Lights should be on separate circuits, with separate controls because you never want them on at the same time. Cheers

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