Foglight wiring
Yep, in theory you can parallel your lights together as many as you like upto the maximum contact rating of the relay.
If you have two pairs of contacts you could use them, but if you're only fitting two lamps I would twin them together and then there's extra capacity in the future
Are there any letters on the relay, or maybe as part of the wiring diagram, called 'NC', 'NO' and 'C' ? They are 'Normally closed when deactuated', Normally open when deactuated, and Common. Both NC and NO are labelled with respect to common, so, NC means that when the relay is off the contacts NC and C are a short circuit and NO to C is open circuit. The reverse is true when the relay is actuated.
I think I've seen the type of relay you're talking about because they use industrial nomenclature when calling contacts 75 and 75a but to be honest once you have isolated the coil terminals and fitted the wiring to make the relay clunk when you flick the foglight switch, the wiring to the lamps cannot cause a problem.
If you make a mistake the lights will either be on all the time, off all the time, off when they should be on and on when they should be off, but as long as you don't connect any of the foglight wires to the coil circuit you will do no damage and your error will be able to be rectified with trial and error of the remaining contacts....if the wiring diagram isn't to hand
I would start by fitting the lamps last, start off by fitting the relay and get it working properly so that you hear it change states when you flick the switch, and then either by trial and error, or using the wiring diagram, or using a circuit tester, identify which two of the remaining contacts close when the relay actuates.
Chris
Posted: Jul 13, 2006 11:42 PM