3 lights and a spliced harness?
- Thread starter James Long
- Start date
I have not purchsed anything yet. but hella only offers a 2x light harness, I was thinking about splicing wires and changing the fuse on the relay. I am just probing for anyone who has tackled this issue, because there are many rovers with three light tabs.
Thanks
Thanks
Then why did you ask? (and waste 72 people's time)James Long said:
Improperly matched electrics can cause your vehicle to turn in to a torch. Ever been around a car fire? Not fun. Even less when it's yours.
The only way to know if what you want to do will work is to do the math. Maybe jcs's is sized right, maybe it isn't. He's using the factory harness, you apparently are going to use aftermarket.
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Radio Shack has automotive lighting relays, cheap. Why chance it? Get another relay and do it right.
You can piggy back the relays with no issues.
Go with 14 gauge wire and you should be ok.
You can piggy back the relays with no issues.
Go with 14 gauge wire and you should be ok.
So let's figure this.jcs2179 said:
You have 12 volts. You have 3 lights at 100 watts each.
If you have 3 lights on one circuit you have 300 watts.
300/12=25amps
What size wire are you using?
Let's figure you are only running 2 lights on one circuit and one light on another.
100/12=8.3amps
200/12=16.6amps
So in order to run one lamp you will need 16 gauge wire, two lamps, 12 gauge wire and three lamps 10 gauge wire.
To account for voltage drop I would run 14 gauge wire in a one lamp circuit. And I wouldn't have three lamps in a circuit unless I was running 8 gauge wire.
That sounds about right for some high performance lighting. A quick check in the ugly's for copper raceway says that is erroring on the side of caution.
Double check the relays too, sometimes they aren't rated for 30 amps and I have seen some rated down to 20 or lower so don't assume because its black square ice cube style its 30A.
Double check the relays too, sometimes they aren't rated for 30 amps and I have seen some rated down to 20 or lower so don't assume because its black square ice cube style its 30A.
Of course it is. That's why the NFPA publishes the National Electrical Code. Because they are cock.James Long said:
:banghead:
I just reread this thread from the top and it dawned on me how stupis this response was:
Ok, so you posted so you could do the math, but you didn't answer the questions that are required information to do the math. And you still haven't answered any of them.
Tell me, did you ever have a math test in school with questions like this:
That was essentially your first post.
James Long said:
Ok, so you posted so you could do the math, but you didn't answer the questions that are required information to do the math. And you still haven't answered any of them.
Tell me, did you ever have a math test in school with questions like this:
I sorta doubt it.
That was essentially your first post.
Those are 55 watts each whereas the 4000's are 100 watts each. Besides, you have Jesus on your side.varova87 said:
55*3=165
165/12=13.75amps
You could use 14 gauge for this.
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Depends on how long the run is. If it's 15' 12 gauge would be the smallest I'd use.rovercanus said: