Bad headlight relay? - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 17 (permalink) Old 04-18-2016, 11:34 AM Thread Starter
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Bad headlight relay?

Hey guys,

I'm having an issue with my headlight.

The bulb is good. I've pulled the relay. I can apply direct power to the relay plug, and the light will come on.

With the relay plugged in, the light doesn't work. The fuse is good as well.

I've tried testing the relay, and it doesn't click or anything. I get anywhere form 97 to 99 ohms of resistance.

I'm at a stand still. I want to test the relays before I spend the $28 on a new one.

Anyone able to lend a hand?

There are plenty of rooms for rent in my head.
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post #2 of 17 (permalink) Old 04-18-2016, 04:20 PM
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what bike, i don't think my 650 has a headlight relay, because the dimmer switch is heavy enough to carry the load so a relay isn't used.

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post #3 of 17 (permalink) Old 04-18-2016, 04:21 PM Thread Starter
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2008 1300 vstar

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post #4 of 17 (permalink) Old 04-18-2016, 04:22 PM
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i don't have that diagram, sorry

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post #5 of 17 (permalink) Old 04-18-2016, 09:06 PM
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Looking at the 1300 schematic, it appears that: If you can activate the relay (brown and yellow leads) and monitor the contact leads (red & green leads), the resistance should be a few ohms. Deactivating the relay should change the resistance to infinity (open circuit).

I'm always working very diligently to discover the obvious.
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post #6 of 17 (permalink) Old 04-18-2016, 09:09 PM Thread Starter
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So if we're at ohms in the 90, is that good or bad?

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post #7 of 17 (permalink) Old 04-19-2016, 04:58 AM
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90 ohms across closed contacts (a short circuit) is high. I would say more on the order of 3 or 4 ohms. Make sure that you put the meter leads together before testing the relay to ensure that the meter, leads, and battery are OK.

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post #8 of 17 (permalink) Old 04-19-2016, 12:32 PM Thread Starter
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So whi,he do I need to check?

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post #9 of 17 (permalink) Old 04-19-2016, 01:09 PM
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If you put +12 vdc on the key terminal of the relay with the ground of your power source to ground on the relay, the relay should energize. With the relay energized the resistance across the other two terminals should be very low (0 to 5 ohms approximately). When you remove the +12 vdc, the ohm meter should have a high value because you are measuring across an open circuit.

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post #10 of 17 (permalink) Old 04-19-2016, 03:21 PM
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if the key (switch) terminal has power with the key on and the headlight terminal has no power the relay is bad. hold your finger on the relay when you energize it by turning the key on you'll feel the contacts close if it's any good. it's just a 4 pin relay that's used in many motor vehicle applications even one out of a junk car would work on your bike as long as the pin configuration is the same

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Last edited by pauli466; 04-19-2016 at 03:32 PM.
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