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Old 12-07-2011, 05:42 PM   #1
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oem light harness ok for 55/100 watt ?

Is the oem headlight harness ok for H4 bulbs that are 55watt low / 100 watt high beam?

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Old 12-07-2011, 05:54 PM   #2
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No. Run relays and a new harness if you want to go > OEM wattage.

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Old 12-07-2011, 06:28 PM   #3
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no. Run relays and a new harness if you want to go > oem wattage.
x2.
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Old 12-07-2011, 08:59 PM   #4
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What would a scmattic look like for putting relays ,and wire size?
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Old 12-08-2011, 01:19 PM   #5
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No. Run relays and a new harness if you want to go > OEM wattage.
why? shouldn't the stock relay be able to handle 100w?
at most would you not just replace the factory relay with a beefier one?

I don't see the point in running a new relay off the relay with a new set of wiring harnesses.. not for headlights
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Old 12-08-2011, 01:22 PM   #6
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the headlight relay is the same relay thats used for fog lights, fuel pump, starter, plenty of high duty electronics. It should be able to handle 100w without any problems.

** If I'm wrong let me know I am planning on upgrading to the cool blue 55/100 tonight off the stock wiring harness.
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Old 12-08-2011, 01:23 PM   #7
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the headlight relay is the same relay thats used for fog lights, fuel pump, starter, plenty of high duty electronics. It should be able to handle 100w without any problems.
Its not the relay size, its the wire size.
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Old 12-08-2011, 01:36 PM   #8
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Relay Diagram

You can use this and modify it to your purpose, it applies to any high draw component you want to add.
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Old 12-08-2011, 01:51 PM   #9
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Its not the relay size, its the wire size.
This. TJ owners should consider themselves lucky. I have an S10 blazer and the factory wiring isn't even up to the OEM headlights. Voltage drop like crazy. It's a common problem and guys are doing the relay mod just to get their OEM headlights to work like they should
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Old 12-08-2011, 02:15 PM   #10
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I've had the 55W / 100W H4 bulbs in my headlights for over 4 years.
No problems for me.
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Old 12-08-2011, 02:15 PM   #11
Knows a couple things...

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There is no relay in the headlight circuit, the headlight switch does it all. Since 100 watts nearly doubles the load of stock headlights, installing an aftermarket relay controlled headlight harness is strongly recommended.
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Old 12-08-2011, 03:10 PM   #12
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Years ago I had first hand experience on buses built on ford chassis where the upfitter wired anything you wanted to come on with the headlights into the headlight switch.

Call the fire department!!!!!!

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