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post #1 of (permalink) Old 11-12-2001, 07:12 PM Thread Starter
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Electrician anyone? wiring Aux lights

My 100 watt lights on my grill guard have been disconnected for some time and id like to get em going again.

How do you determine AMP draw, is it volts divided by watts = amps?

I had them wired with a H.D. 30 amp relay," Load "on the positive BATT terminal, but after having them on for just about 10 minutes(this happened a year ago, btw) it fried my alternator and it turned around and shorted my battery![img]/wwwthreads_images/icons/mad.gif[/img]

Could it had been just a coincidence or is two 100 watt halo bulbs too much for the stock 65 AMP alternator?

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post #2 of (permalink) Old 11-12-2001, 09:18 PM
 
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Re: Electrician anyone? wiring Aux lights

This is what I am in the middle of doing. I had plans to connect them to the same place. I don't see why it would fry the alt. or short the batt. unless you had the head lights on high, running the fan on high and jammin' while the engine was at idle.

The formula for power is amps=watts/volts.

Running two 100w lights will yeild 17amps with about .08ohms resistance

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post #3 of (permalink) Old 11-13-2001, 01:14 AM
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Re: Electrician anyone? wiring Aux lights

I*= V/R
**= 14/.08
**= 175 AMPS!!!

maybe .8 ohms? ;-)


Your Toy is loaded huh? Does it have Power Engine?

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post #4 of (permalink) Old 11-13-2001, 11:15 PM
 
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Re: Electrician anyone? wiring Aux lights

I made an oops with the decimal point but you did also. 14v(12v)/ .8ohms is 17.5amps(15amps) not 175amps![img]/wwwthreads_images/icons/wink.gif[/img]

Havack!

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post #5 of (permalink) Old 11-14-2001, 12:12 AM
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Re: Electrician anyone? wiring Aux lights

everybodys math seams right 200 watts at 12v draws 16.7 amps
but it seams like you connected your relay backwords depending on your relay you should have 4 connections line load ground and coil
line- connects to battery it would be a good idea to put a fuse in that line 20 or 25 amps would be good use 10 gage or larger wire
load- connects to your lights heavy wire on this too
ground- connects to ground you can use 16 gauge wire
coil- connects to one side of the switch for the lights connect the other side to a key on power sorce and fuse it at 1 to 2 amps

im woundering were 8 ohms is comming from?



post #6 of (permalink) Old 11-14-2001, 07:19 AM Thread Starter
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Re: Electrician anyone? wiring Aux lights

Yeah muddy 175 amps?[img]/wwwthreads_images/icons/shocked.gif[/img] i would have to use battery cables and a HUGE solenoid for a relay!!![img]/wwwthreads_images/icons/laugh.gif[/img]

Jim, i was using one of those older style truck accessory relays, the metal ones with three terminals(B=battery- L=load-S=switch).hard to go wrong on those i think anyways.

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post #7 of (permalink) Old 11-14-2001, 01:28 PM
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Re: Electrician anyone? wiring Aux lights

The metal ones use the case as the coil ground, so you have to mount it to grounded metal or run a ground wire off the mounting screw. I can't imagine how that would have fried the alt & batt, so I have to guess they were in bad shape before.

I use 30A relays from '92-up engine compartment fuse panels as my accessory relays. You can find some with plastic mounting tabs & others with grounded metal mounts (those are usually in European cars). They have 4-5 terminals (SPDT) and their standard wiring diagram is usually molded into the side or top.


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post #8 of (permalink) Old 11-14-2001, 02:45 PM
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Re: Electrician anyone? wiring Aux lights

Ummmmm, no? I was just showing that Havack's resistance would yield INSANE current, not trying to show the actual values! Quite obviously the lights don't pull 175 amps :-) It's not a starter! Nevermind, damn, I should've just left him alone ;0


Your Toy is loaded huh? Does it have Power Engine?

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post #9 of (permalink) Old 11-14-2001, 05:40 PM Thread Starter
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Re: Electrician anyone? wiring Aux lights

I figured that Muddy, but i didn`t understand that math[img]/wwwthreads_images/icons/blush.gif[/img] Soooo, i was just being a wise-a$$ as usual...[img]/wwwthreads_images/icons/wink.gif[/img]

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post #10 of (permalink) Old 11-15-2001, 07:32 AM
 
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Re: Electrician anyone? wiring Aux lights

Now that I reread I see the slam. My bad on the decimal!

Havack!

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