getting soap box out again, beware rant on electrics | General Chat | GBS Owners Club

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getting soap box out again, beware rant on electrics
September 15, 2016
12:21 am
GBS Technical
Forum Posts: 2342
Member Since:
August 9, 2013
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Wiring, I like wiring, its like a puzzle, you follow the dots (diagram) and it works or goes up in smoke, a bit like Russian Roulette Smile

OK, nothing like Russian Roulette, the system is so over protected all you get is a small pop when the fuse blows.

but it does amaze me how builders get into some very odd situations.

the switches we use, the Savage type are rated to 10 amp. this means they can pass a current of 10 amp at 12 volt.

volts x amps = whatts

so a 21 whatt brake light bulb would need 21/12 = 1.75 amps

a side light is 5 whatt, 5/12 = less than half an amp x by four and the total draw on the side light circuit is approx 2 amp plus dash lights etc..

So why, use wiring that could start the car.

0.5 thin wall is rated at 11 amps, 0.75, 14 amps and 1.0 over 16 amps.

not only is larger cable more expensive, but terminals must be sized carefully, it is harder to run neatly, and looks a mess much quicker.

calculate what will do the job, don't go overkill.

If anyone is planning anything other than plug and play, post me

September 15, 2016
12:23 pm
Forum Posts: 53
Member Since:
August 18, 2013
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Well said Simon, totally agree with you.

As someone who decided with the variations from a standard Zero build to do all the wiring myself, you are most correct about choosing the correct sized wiring.

Doing simple calculations to determine the load which the wires need to carry makes choosing the correct wiring to purchase a lot easier. With the exception of the headlight bulbs, everything on my car is LED so low current draw. I used 11amp and 16amp wiring for all of the circuits with the exception of the battery cables and starter motor/alternator cables which obviously need to carry a much higher current.

If you are able to do the simple calculations and aren't put off by creating your own looms, great, go for it.

Otherwise, it would be a good idea to stick with the GBS looms which are made for the job and you just need to route them and connect up. Easy Smile


If it isn't broken; take it apart and fix it!

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September 15, 2016
8:01 pm
Wing Buckinghamshire
Forum Posts: 65
Member Since:
September 7, 2013
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good points Simon keep the cables thin that keeps the weight down means more speed LaughLaughLaughLaugh

January 31, 2017
10:46 pm
Forum Posts: 75
Member Since:
March 3, 2016
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I love electrics gives me goose bumps and makes my hair stand up on end especially when I'm hugging both high voltage terminals??

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