H4 Dual Headlight Relay Kit - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 12 Old 11-29-2009, 09:49 AM Thread Starter
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H4 Dual Headlight Relay Kit

Hi,
Is an H4 Dual Headlight Relay Kit, either from Eastern Beaver or a home made verison worth the money or effort? I understand the theory is to got more voltage to the light. I did it to to my old (1986) VFR and I don't recall being a notable difference.

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post #2 of 12 Old 11-29-2009, 10:56 AM
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Test it for yourself. Rig a voltmeter across the headlight bulb terminals with a pair of jumper wires and compare the voltage at the burning bulb with the voltage at the battery terminals with the engine running at the same rpm...or the engine off. The only way a relay kit brings more voltage to the headlight bulbs is if the stock wiring is way too skinny and causes a voltage drop. I don't think this is the case. If you test it, please let us all know. By the way, my Vstrom headlight wiring is bigger gauge wiring than my Toyota Tundra headlight wiring.

I don't think the relay kit is worth it with stock wattage headlight bulbs. Yes with over wattage bulbs. I'd rather use high output stock wattage bulbs, although those have a shorter life than stock bulbs.

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post #3 of 12 Old 11-29-2009, 11:19 AM
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A big benefit of a relay kit is to prevent problems with the stock wiring. Many troopers have had problems with the normally closed contacts on the starter switch, the connector under the rubber boot, the connector behind the radiator or the hi-lo switch contacts. Add a relay and all those potential problems go away. The energy going into overheating and compromising those connections goes to the lights instead.

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post #4 of 12 Old 11-29-2009, 11:24 AM
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The justification for a kit on these bikes is that on the stock set up, all the voltage (and amperage) that powers the headlights also runs through the tiny contacts in the flash-to-pass, high beam, and headlight cutout on the starter switch. When these contacts make or break over hundreds of cycles, they can arc and become pitted to the point of failure.

Search for 'sudden headlight failure' and you'll see that it's bad contacts that caused it.

With the relay kit, you're using the existing circuit as trigger voltage for the relays (substantially less current draw), and the power for the headlights comes right off the battery.

Will a headlight relay kit alone make your lights burn brighter? Hard to tell with mine installed, but the peace of mind knowing that they won't face sudden failure is worth it to me!

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post #5 of 12 Old 11-29-2009, 01:01 PM
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Quote:
Originally Posted by donstrom6 View Post
Will a headlight relay kit alone make your lights burn brighter? Hard to tell with mine installed, but the peace of mind knowing that they won't face sudden failure is worth it to me!
Yeah, they are brighter if you compare one bulb with the stock connector and one with the relay, but as you said, that isn't the main justification for the kit.

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post #6 of 12 Old 01-07-2010, 04:57 PM
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Originally Posted by PTRider View Post
Test it for yourself. Rig a voltmeter across the headlight bulb terminals with a pair of jumper wires and compare the voltage at the burning bulb with the voltage at the battery terminals with the engine running at the same rpm...or the engine off. The only way a relay kit brings more voltage to the headlight bulbs is if the stock wiring is way too skinny and causes a voltage drop. I don't think this is the case. If you test it, please let us all know. By the way, my Vstrom headlight wiring is bigger gauge wiring than my Toyota Tundra headlight wiring.

I don't think the relay kit is worth it with stock wattage headlight bulbs. Yes with over wattage bulbs. I'd rather use high output stock wattage bulbs, although those have a shorter life than stock bulbs.
It is the case, there is a very measurable voltage drop. I found out when I wired my voltmeter into the headlight wiring instead of directly to the battery.

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post #7 of 12 Old 01-08-2010, 10:06 AM
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Just wanted to point out that VFRs have factory headlight relays so not much to gain there. That's one reason Hondas cost more.

The H4 Dual Relay Kit is the first thing everyone should put on their VStrom.

Consider that when you press the flash to pass button, all four filaments light up. That's 20Amp running through all them skinny stock wires, connectors and switches. Something is going to burn up eventually, and maybe even sooner.

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http://easternbeaver.com/ - Motorcycle Electrics: 2007 DL1000 with 16/43 gearing, Superbrace, Tokico 4 Pot fronts, BackoffXP, H4 Dual Relay Kit, PC-8 Fusepanel, 2 Powerlet Sockets, Suzuki Centerstand - 1988 Africa Twin 650, 1990 VFR 750.
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post #8 of 12 Old 12-05-2010, 03:31 PM
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Quote:
Originally Posted by acormier7 View Post
Hi,
Is an H4 Dual Headlight Relay Kit, either from Eastern Beaver or a home made verison worth the money or effort? I understand the theory is to got more voltage to the light. I did it to to my old (1986) VFR and I don't recall being a notable difference.

I did this and the difference is huge. My lights are much brighter, and now I worry about the guy in front of me being pissed off.

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post #9 of 12 Old 03-31-2011, 01:49 PM
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Sorry to Zombie-resurrect this thread, but I was curious whether the draw on the battery is higher with the relay kit installed, or does it just eliminate wasted current?

i.e.: if you put the relay on, are you drawing more power or about the same wattage from the electrical system compared to the stock installation?
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post #10 of 12 Old 03-31-2011, 02:29 PM
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More power goes into the lights instead of heating up the wiring and regulator heat sink. If there is worry about powering heated gear, switch to HID lights. They take less power while providing more light, don't pulse with the heat controller and the kits include a relay.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
See https://www.stromtrooper.com/general-...nicknames.html

Please vote in the poll on what Strom(s) you have at https://www.stromtrooper.com/informat...-you-have.html
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