OK here's what's going on.I have a 2002 TJ 4.0

I have four 100watt Lights on my light bar connected to a 30 amp relay, a 30 amp fuse and a heavy duty rocker switch.

I have two 55 wat rock lights connected to the factory fog light wires.

I have four 55watt rock lights connected to a 30 amp relay, a 15 amp fuse and a heavy duty rocker switch

Plus my two 55watt factory headlights.

Total wattage is 840 when I turn all the lights on.

I'm currently running a factory alternator with a Yellowtop battery.

I tested all the lights yesterday while the engine was on idle. Just a few minutes after, the battery voltage meter wen to approx 10 volts. I left it like that for about 10 minutes and it was still around 10 volts. When I rev'd the engine, the battery voltage meter went back up to 14 volts.

I drove the Jeep around the parking lot with all the lights on for 10 minutes and the battery voltage meter stayed at 14 volts (which is normal).

I don't want to have something burn up in the middle of the trail in the middle of the night so my question is, will my alternator coupled with the Yellow tyop battery carry this much wattage or will something fail? Should I upgrade my alternator or install a second yellow top battery? what do you guys think?

 

What's an sPod Jen? can I google it? let me check...

 

 

Thanks for the info. I just won't light everything up at the same time until I get a stronger alternator. Another memeber suggested I use LED's for my rock lights so I won't drain as much power. Once these lights break (some day) I'll switch them to LED's and upgrade my alternator when I get the mula. Thanks for info and all the help.

What's going to happen when I get a winch?

 

now that....I must get on video!

 

I have it on good authority that you can't count the 2 lights on your bull bar!

 

I took my alternator off and took a trip to the local rebuild shop. They outfitted me with a smaller pulley. I've done this on all my trucks for the last 15 years or so. Basically, a smaller pulley runs the alternator faster at idol. Just like reving the engine.

 

X2 for the Spod. John is awesome. He has the best customer service i have ever experienced to date! Give him a call, their stuff is Great!

 

useing watts law: 4 100 watt lights (400 watts) / 12 (volts) = 33.333 amps on a 30 amp relay/fuse. most heavy duty switches for auto use are rated at 30 amps also. you are drawing too much through that line

i don't know what the factory wires are or what they are fused at but i would think 55 watts would be fine

4 55 watt rock lights (220 watts) / 12 (volts) = 18.33 amps. 30 amp relay is fine but swap the 15 amp fuse for a 20 amp.

yes you need to upgrade your alt, but you know that, i'm just helping to prevent a fire under your hood and blown fuses.

 

I agree. 4 100 watt lights are way too much for one circuit. Just run a second set of wires and another relay. You can still use one switch. I run one 30A relay per pair of 100w lights. And up to 4 55w lights per 30 amp relay. I have 25A fuses in both cinarios.