Is It time for a second Battery

[MuleShoer]

I recently installed a pair of LightForce 240 Blitz's.
When I turned them on I noticed that the illuminated switch was dim. then after about a mile the lights shut off. You could turn off the switch then turn them back on but they would only stay illuminated for about 5 seconds. When I turned off the switch and drove about 5 miles they once again would stay illuminated for about a mile.

I am assuming they are drawing quite a bit of current and this is the reason for the cut off
The vehicle is a Jeep JK with stock altenator

For fun we measured the candle power of these lights and each one is about 56,000 cp
compare that to my brights at 5,000cp

I was going to replace the current battery with a diehard platnuim but do I need add a second battery?...what about the altenator

 

[DaveInDenver]

Still running the halogen bulbs or are they HID converted? Are you using a fuse or circuit breaker in the system? What size wire is feeding the lights and where did you tap power?

If they're still incandescent, sounds like a circuit breaker opening. They use AFAIK 100W bulbs, so a pair is 200W or about 14.5A at 14V. With the symptom of a dim indicator, I'd also be looking at grounds. If you've converted them to HID, then they could switch off, but halogen bulbs don't just turn on and off. They go dim if you're under voltage.

Just guessing, but I doubt you are taxing the stock electrical system.

 

[MuleShoer]

Still running the halogen bulbs or are they HID converted? Are you using a fuse or circuit breaker in the system? What size wire is feeding the lights and where did you tap power?

If they're still incandescent, sounds like a circuit breaker opening. They use AFAIK 100W bulbs, so a pair is 200W or about 14.5A at 14V. With the symptom of a dim indicator, I'd also be looking at grounds. If you've converted them to HID, then they could switch off, but halogen bulbs don't just turn on and off. They go dim if you're under voltage.

Just guessing, but I doubt you are taxing the stock electrical system.

More vitals:
They are Halogen 100w bulbs, I am using the LightForce Harness; Power is a direct tap to the battery, ground is to a ground stud on the fender; There is a fuse on the power wire to the battery, there is a relay in the harness, I did not use the switch that came with the lights, I used an ARB style switch instead, so I cut and crimped the lugs ( I will recheck the crimps and switch)

 

[DaveInDenver]

So fused, no circuit breaker. I assume the fuse is not opening. Sounds like the relay is opening. I'd try running a solid ground to the battery as a test, too.