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Where does this wire go?
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post #1 of 32 (permalink) Old 07-13-2013, 05:27 PM Thread Starter
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Help with wiring relay

I ordered a nice relay kit off Amazon that included a 30/40A relay, 30A in-line fuse, and the connector for the relay with wires already ready to go. For the price I was pleased.

Now, I have zero electrical experience with diagrams and such, so I could use some help from you pros out there. I have a pic of the set, the top of the relay (diagram), the bottom of the relay (numbered posts), and the connector next to the relay showing what wire to what tab. I got two since I was going to run the ignition coils off of one, and the voltmeter off of the other. Should I just run them off the same relay, since the ignition coils are only 10A or so? More importantly, what goes where?

# - Color (Position based on image)

87 - Yellow (top)
86 - White (mid, left)
87a - Red (mid center)
85 - Black (mid right)
30 - Blue (bottom)








1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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post #2 of 32 (permalink) Old 07-13-2013, 05:42 PM
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It appears to be a standard ISO relay.

30-aux power (bat?)
87-work (load)
86-switch power(orig coil wire ?)
85- grd

HTH....

edit-you are correct, 30 terminal would be a good place to power a voltmeter.

edit 2-87a (the center terminal) is not used, as it would power the 'work' when the switch (86) is off.

Last edited by wmsonta; 07-13-2013 at 05:57 PM.
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post #3 of 32 (permalink) Old 07-13-2013, 06:34 PM
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Here is the explanation of how this relay is going to work. Think of it this way, its just a switch. Instead of flipping the switch with your fingers (like a light switch)
Having a ground on 85 and power applied to 86 will cause the switch to flip. Both conditions for 85 and 86 have to be met for the switch to operate.

When looking at the diagram of the relay as it sits (no power) pins 30 and 87a will be connected. As soon as you have a ground on 85 and power to 86 pins 30 and 87a will open and 30 and 87 will be connected.
Imagine that the line connected to 30 going to 87a is now going to 87.

Last edited by ifixf18s; 07-13-2013 at 06:38 PM.
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post #4 of 32 (permalink) Old 07-13-2013, 07:12 PM
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Yup.

And to make it more convenient or confusing 30 and 87 are reversible. 85 and 86 are as well.

Ask specific questions?
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post #5 of 32 (permalink) Old 07-13-2013, 07:14 PM
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Quote:
Originally Posted by wmsonta View Post
It appears to be a standard ISO relay.

30-aux power (bat?)
87-work (load)
86-switch power(orig coil wire ?)
85- grd

HTH....

edit-you are correct, 30 terminal would be a good place to power a voltmeter.

edit 2-87a (the center terminal) is not used, as it would power the 'work' when the switch (86) is off.
87a is the same as 87 so if you wanted yor volt meter to work only when the key is on hook it up to 87a

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post #6 of 32 (permalink) Old 07-13-2013, 07:20 PM
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87 and 87a are backwards. 87a will be powered when the activating circuit has no power. 87 will be powered when the activation circuit has power. 87a and 30 are common when nothing is attached. 87a and 87 are never common.
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post #7 of 32 (permalink) Old 07-13-2013, 07:34 PM Thread Starter
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Well, that's a slew of information there, yet I'm still confused. Here's how I think I'm imaging this...

Battery (+) -> 30A Fuse -> Relay #30

Original Ignition Coil Power (+) -> Relay #86

Relay #85 -> Ground

Relay #87 -> Voltmeter(+) (and/or) Ignition Coils (+)

Does that sound right, or am I missing the mark? It appears 87a will be unused unless I want something to be on when the bike is off (could be useful for an alarm? not sure)

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350

Last edited by thtanner; 07-14-2013 at 03:50 AM.
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post #8 of 32 (permalink) Old 07-13-2013, 07:39 PM
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Quote:
Originally Posted by thtanner View Post
Well, that's a slew of information there, yet I'm still confused. Here's how I think I'm imaging this...

Battery (+) -> 30A Fuse -> Relay #30

Turn Signal Running Light (+) -> Relay #86

Relay #85 -> Ground

Relay #87 -> Voltmeter(+) (and/or) Ignition Coils (+)

Does that sound right, or am I missing the mark? It appears 87a will be unused unless I want something to be on when the bike is off (could be useful for an alarm? not sure)
Yes. Exactly. Only for ease of instillation, either circuit can be turned around. 30 and 87 can be swapped, 85 and 86 could be swapped. Voltmeter can go to 87 or 30.

edit-tanner, I would want a trigger that dies with the kill switch, don't know about turn signals.

Last edited by wmsonta; 07-13-2013 at 07:49 PM.
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post #9 of 32 (permalink) Old 07-13-2013, 08:07 PM
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....I did it the easy way....I conned Merc and KC to come over and do it for me, lol....when it comes to "lectrics", Im a dope...yet I used to solder radios together on PC boards....go figure....

Dumb question, but on topic...if you have too many relays, will that strain your electrics ?...way I understand, its current that causes them to open/close....if one has 15 relays hooked up, will it strain the battery, etc ?



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post #10 of 32 (permalink) Old 07-13-2013, 08:08 PM Thread Starter
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Quote:
Originally Posted by wmsonta View Post
Yes. Exactly. Only for ease of instillation, either circuit can be turned around. 30 and 87 can be swapped, 85 and 86 could be swapped. Voltmeter can go to 87 or 30.

edit-tanner, I would want a trigger that dies with the kill switch, don't know about turn signals.
I honestly don't use the kill switch unless it's an emergency. I'll usually keep the bike in first and drop down the kickstand to kill it, or use the key as I'm coasting in to the lot (to keep noise down).

That is a good point though, and probably should be noted if anyone is reading this thread in the future for reference. Maybe I'll just use the original coil power wire for the trigger instead.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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