Brakes dim all lights real bad.

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Motorcycle: 1995 GL1500 SE

Brakes dim all lights real bad.

Post by brett2413 » Wed Dec 19, 2012 9:19 am

Heres the problem, I've noticed in the last couple weeks that when I apply the brakes to the point that the brake light comes on the headlight and dash lights will dim way down. One other thing that has happened is the headlight went out on the way home a couple days ago, I pulled over and checked the fuses, all were fine, and when I turned the bike back on the headlight came on. I can't fing a wire diagram for my gl1500 on the web that I can download, but I'm thinking it may be a proplem with the ignition switch or a bad ground or loose power wire as I don't have a problem with the charging system that I can tell. I will be off work for a few days so along with replacing my front tire I want to fix this problem, thought if any had been there they could point me in the right direction and save me a little time. I'm a mechanic by trade so this isn't anything big for me just wish I had a schematic to follow.
Thanks in advance.

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Re: Brakes dim all lights real bad.

Post by vtxcandyred » Wed Dec 19, 2012 5:20 pm

Probably the best thing you can do is buy the book.

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Re: Brakes dim all lights real bad.

Post by regwal » Wed Dec 19, 2012 11:19 pm

Usually when your lights dim when applying brake your battery is on it's last leg.

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Re: Brakes dim all lights real bad.

Post by thrasherg » Thu Dec 20, 2012 12:25 am

This sounds like an earthing problem. I would be checking the connections from the headlight to the frame, battery negative terminal to the frame and the earth lead from the rear lights to the frame. I suspect the wires will be broken, or the connections very corroded.


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Re: Brakes dim all lights real bad.

Post by WingAdmin » Thu Dec 20, 2012 7:26 pm

This is the closest thing I have - it's 1994, not a 1995, and not the greatest image, but hopefully it can help you out a bit.

1994 GL1500 Lighting Schematic
1994 GL1500 Lighting Schematic

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Re: Brakes dim all lights real bad.

Post by trike lady » Fri Dec 21, 2012 10:55 pm

Swap relay #3 with one that has the same rating also to see if the problem is still present.
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Re: Brakes dim all lights real bad.

Post by wiredgeorge » Mon Dec 24, 2012 11:12 am

If you don't have a load tester, take your battery to an auto parts store and have it tested. If it tests OK, then:

Put a multimeter set to VDC (20VDC) on your battery and check voltage at 3K rpm. You should see about 13.5 to 14 VDC; this will tell you if the alternator which seems to contain the reg/rec on the 1500 is working as it should. If you don't see this voltage, then your battery won't charge. If you have a good charge system then you should:

Check main frame ground and secondary ground points. The black and white wiring diagram is a horror as the wire colors change as they go through connectors and are hard to follow.

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