Relays: What they are, how they work, how to replace them (Video)

[WingAdmin]

I've posted a new video, describing what relays are, how they work, why our bikes have them, and then demonstrate how to replace them when they have failed.



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[Northwings]

Do first generation GL-1800s use the same or similar relays? Do you sell them?

[WingAdmin]

Do first generation GL-1800s use the same or similar relays? Do you sell them?

No, the GL1800's use a completely different relay. They are smaller, and there are a lot more of them. Honda sells the GL1800 relays for under $5 apiece, so I never bothered to even investigate sourcing them.

[erkmann]

Scott makes a strong case for using these improved relays. My question is this: If my bike is disabled on a long ride by virtue of a faulty (original) relay, might it have been good insurance to have replaced NOW all eight relays, keeping 1-2 of the old ones for backup? Certainly more than $104-worth of hassle trying to troubleshoot 1000 miles from home!

[Wingsconsin]

When I had my 1500 I owned a few of these first gen relays - they worked fine.
Then I started a resto-mod on my 1983 GS850 and needed a good quality set of relays for electrical systems I installed -
The GS850 was notoriously under powered with a stator and R & R system that didn't work as well as hoped -
So I updated the Stator & R & R and many other electrical items (coils, wires, etc)
By installing relays I was able to put power where I needed it when I needed it without taxing the system and existing wiring -
THESE high QUALITY relays are the heart of my 1983 system right now

[CrystalPistol]

Nice job Sir!

I just got two more … so I have 5 of them now, thought about replacing some or all … just because these seem better but after watching the video, I see I'm gonna have to look close at access to relays as I have a trike and the left rear fender doesn't move aside. Thought was to replace 5 most loaded ones and saving OEMs as "spares". I'll work it out in the basement somehow, better than doing it roadside I think. If a major PITA, I'll get a couple or three more & do all of them (7 I think?).

Just wanted to say Thank You.

[Ed Brock]

Wingadmin,
Very nice video. I found the tricks (what I was hopping to see) very detailed. By the way, I admit my air tools are fast, But your wrist action is faster. Well done. Is there such a thing as a guessamate to the life expectance of these relays? I know in cars (a lot less water/dirt gets to them then on a bike) relays most times never need replacing.
Ed

[WingAdmin]

Wingadmin,
Very nice video. I found the tricks (what I was hopping to see) very detailed. By the way, I admit my air tools are fast, But your wrist action is faster. Well done. Is there such a thing as a guessamate to the life expectance of these relays? I know in cars (a lot less water/dirt gets to them then on a bike) relays most times never need replacing.
Ed

That wrist action is sped up video, so you don't have to sit there watching me tighten bolts!!!!

Relay life varies. They normally have a shorter lifespan in motorcycles due to vibration and heat.

[Ed Brock]

Sped up video????? NO WAY!! Are you sure? Maybe your "S u p e r W r e n c h" and your just trying to fool us. (hehe)
Ed

[daviss2@ohio.edu]

Watched, ordered, installed and "PRESTO"...all my inoperative gauges and lights came back to life! Thanks Scott, could not have done this without your excellent video, explanations and information!

For anyone interested: the gas gauge, temp gauge, reverse light and function, "OD" light, and bag lights all went out at once. Consulted with Scott through this forum and he recommended fuse #8 or relay #3. Only thing I didn't get from the video is which relay is #3 - turns out it's the far right relay on the top row of three as you're looking at them (hardest to get to). I swapped out the third one down the left row first and nothing...second try was the money! Perhaps by describing the relay based upon the descriptions on the cover would have saved me a step, but really no big deal. All his other tips and tricks to get to them worked as he described. THANK YOU! (I bought 2 so I'd have a spare).

PS: my onboard tool kit did not have a 13mm which was needed for the seat removal!?!

[Rambozo]

A slightly different take on relays.


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[WingAdmin]

A slightly different take on relays.


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Mehdi's demonstration of relay contact welding in that video is an excellent example of what happens to our starter relays when they wear out. The contacts become pitted and stick together, running the starter motor continuously. Often whacking the relay with a screwdriver handle or something hard will get it to release, but if it's happened once, it will continue to happen - so if it's happened, it's time to replace that relay.