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12v spotlights on 24v truck?


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2-stroke 
Member - Posts: 6
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Joined: April 08, 2013
Location: Australia
Posted: August 21, 2014 at 12:31 AM / IP Logged  
I'd like to install a spare pair of 12v spotlights on my new 24v truck.
They have a normal 12v H3 globe and two wires coming out the back, no electronics, just a simple lens, globe, reflector type spotlight.
I'm guessing that it's as simple as replacing the globes for 24v H3 ones but I want to check that there is not some other factors to consider.
Thoughts anyone? :)
oldspark 
Gold - Posts: 4,913
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Location: Australia
Posted: August 21, 2014 at 5:28 AM / IP Logged  
Assuming they are halogen, no problem.
Being a similar power but at 24V means half the current so any 12V spot wiring will be fine.
2-stroke 
Member - Posts: 6
Member spacespace
Joined: April 08, 2013
Location: Australia
Posted: August 21, 2014 at 9:06 AM / IP Logged  
Great, thank you Oldspark :)
i am an idiot 
Platinum - Posts: 13,666
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: August 22, 2014 at 9:44 AM / IP Logged  
Have you thought about just running the 12v devices in series?
oldspark 
Gold - Posts: 4,913
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Posted: August 22, 2014 at 11:32 AM / IP Logged  
That's likely to have grounding issues & hence blow one bulb since H3s are single wire with base GND and most reflectors are grounded, else can easily be shorted to GND.
If the bulbs were 2-wire or isolated, if one bulb dies, both die. And if they have unequal resistances...
i am an idiot 
Platinum - Posts: 13,666
Platinum spaceThis member consistently provides reliable informationspace
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Location: Louisiana, United States
Posted: August 22, 2014 at 8:33 PM / IP Logged  
He said he has 2 wires coming out of each socket.
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: August 23, 2014 at 10:03 AM / IP Logged  
Good point, but if it's a metal reflector bonded to metal body etc. (Tho I did miss the 2 wires part 12v spotlights on 24v truck? -- posted image..)
PS - plus I question startup & imbalance issues that take one well over 15V etc. It's not like linear components (resistors, caps etc) nor like 2 series 12V for 12V DRLs.
Series 2x12 for 24V is a good idea in a pinch and may work fine, but I'd be inclined to buy 24V bulbs & keep the 12Vs as spares for 12V lights.

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