alan0043 Posted February 16, 2018 Report Share Posted February 16, 2018 Hi Everyone, I have asked questions earlier about rocker switches and have received great advice. I have been doing more research on line, how to wire up a relay. Here is my question or too. I hope I have this right. From what I have read I need to have 2 fuses in my system for the auxiliary lights. One fuse (3 amp) for the rocker switch and the other fuse (20/25 amp) for the #30 post on the relay. Is this correct ? Or is there another way to do the wiring ? This is my first time of wiring any relay. Thank you for any input, Al 2012 Volvo VNL 630 w/ I-Shift; D13 engine; " Veeger " Redwood, model 3401R ; 5th Wheel Trailer, " Dead Wood " 2006 Smart Car " Killer Frog " Link to comment Share on other sites More sharing options...
DesertMiner Posted February 16, 2018 Report Share Posted February 16, 2018 What are you hooking up to this relay that you need such a large fuse on Pin #30 on the relay? Link to comment Share on other sites More sharing options...
Quickthrotl Posted February 16, 2018 Report Share Posted February 16, 2018 fuse pin 30 2004 Volvo VNL 780 2017 Momentum 376TH 2007 Harley Davidson FLHTC 2009 Smart4two Link to comment Share on other sites More sharing options...
alan0043 Posted February 16, 2018 Author Report Share Posted February 16, 2018 45 minutes ago, DesertMiner said: What are you hooking up to this relay that you need such a large fuse on Pin #30 on the relay? Hi Desert, The plan is install two 18 watt LED work lights on the back of the truck. I understand that I do not want to have high current going thru the rocker switch. That is the reason for using a reply. Al 2012 Volvo VNL 630 w/ I-Shift; D13 engine; " Veeger " Redwood, model 3401R ; 5th Wheel Trailer, " Dead Wood " 2006 Smart Car " Killer Frog " Link to comment Share on other sites More sharing options...
Quickthrotl Posted February 16, 2018 Report Share Posted February 16, 2018 your lights are probably only going to pull about 1.5-2 Amps each, so depending on the wire size you use I would say you could get by with a 7.5 to 10 amp fuse 2004 Volvo VNL 780 2017 Momentum 376TH 2007 Harley Davidson FLHTC 2009 Smart4two Link to comment Share on other sites More sharing options...
DesertMiner Posted February 16, 2018 Report Share Posted February 16, 2018 21 minutes ago, alan0043 said: Hi Desert, The plan is install two 18 watt LED work lights on the back of the truck. I understand that I do not want to have high current going thru the rocker switch. That is the reason for using a reply. Al I agree with Quickthrotl...... Link to comment Share on other sites More sharing options...
alan0043 Posted February 16, 2018 Author Report Share Posted February 16, 2018 36 minutes ago, DesertMiner said: I agree with Quickthrotl...... Hi Guys, Thank you for the help. I will use a 3 amp fuse for the rocker switch and a 10 amp fuse for the # 30 post on the reply. Al 2012 Volvo VNL 630 w/ I-Shift; D13 engine; " Veeger " Redwood, model 3401R ; 5th Wheel Trailer, " Dead Wood " 2006 Smart Car " Killer Frog " Link to comment Share on other sites More sharing options...
NeverEasy Posted February 17, 2018 Report Share Posted February 17, 2018 two 18 watt lamps for 36 watts total. Current = Power divided by Voltage or 36/12= 3 amps. This also will help to know what wire size to use for the given distance x 2. 16 AWG wire will likely do. Fuse to 5 amps and try it. Fuse small enough to protect the wire, not the lamps. Frankly, you can find plenty of switches that will handle 20 amps. No need for a relay unless you just want to. I love relays!. Chet & Deb '01 Volvo 660 w/ Smart '19 Forest River Columbus 320RS 5th wheel 2022 Chev 2500HD Long Bed Retired CWO4, USN and federal service Electronics Tech/Network Engineer/Welder/Machinist Link to comment Share on other sites More sharing options...
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