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Coil relay mod

  • Thread starter Thread starter Narcoleptic_Snowman
  • Start date Start date
horror1972 said:
It isn't that hard, a relay:

85 is ground and 86 is any positive power.
this 2 terminals are the coil of the relay, or the electronic switch.
you can feed 86 from about 9 to 14 volts.
30 is the input, and 87 the output, so it doesn't matter what's on the 30 terminal, the only thing it does is connect 30 and 87 when the coil is activated; 78a works the opposite; when the coil isn't activated,it's connected with 30, and when the power is on 86, it disconnects.

so what you do with this mod is using the o/w wire from the killswitch to switch the coil (86) and get a fresh battery power from the 30 terminal at 87.
unless you have bad wiring or a bad killswitch, it doesn't make any difference.

hope this make sence.
Click to expand...

Thanks for the input but it turns out that wiring wasn't the issue. My main problem was that I didn't know I needed to have both plugs from a given coil grounded to have good spark. Given that I probably never had a spark problem in the first place and I only picked up .3v by doing the coil mod and never found any resistance in the wiring over .4ohm this has probably been a waste of troubleshooting time. But hey, at least now the coil mod is done and I can get back to figuring out my dead cylinder issue.

86 has to be switched power so the coils aren't always energized, 30 has to be +12v from the battery, fused.

87a is not the same on all 5 pin relays! Two of mine have a different diagram and 87 & 87a function exactly the same. I also have a 5 pin with two 87 connections, the 87&87a relays I tried work just like the one with two 87 terminals.


/\/\ac
 
I'm hoping for a quick response for this so if anyone knows please let me know! Anyway...does anyone see any problem with using 12 gauge all the way around, I've always been told to match the ground and power wires, and also I'm not sure if I have the right relay. Mine looks like this...Dorman #84601

relay.jpg
 
12 gauge wire should be ok... as long as its thicker or the same as the stock wiring you will be ok.

and yes that relay should work just fine
 
problem

problem

coils.jpg


Can I join the orange wires together and connect them to my wire going to 86? And will my starter be inside the engine cover?
 
Well it turns over but its not firing. I took both orange wires on the coils and joined them together along with the wire going to the relay. I think it might be they way I wired the starter. I hooked the wire from the relay to the top nut of the starter assuming that was the positive wire on the coil. Help!
 
cyberdork said:
Well it turns over but its not firing. I took both orange wires on the coils and joined them together along with the wire going to the relay. I think it might be they way I wired the starter. I hooked the wire from the relay to the top nut of the starter assuming that was the positive wire on the coil. Help!
Click to expand...

Did you plug everything back in? ;) I know I didn't....twice. First I left of the signal wires at the igniter box and then later I forgot to re-attach the new ground for the relay when I was moving wiring around.

Mine is done and ready to take out for a shake down run now but looks like it'll be right after work tomorrow or Thursday. I'll have to post back a pic of the wiring! I think it came out pretty good.

/\/\ac
 
alright here's the way I did it

-ground to a frame point
-1 wire that goes from the relay to the top point of the starter
-1 wire that goes from the relay to BOTH of the orange white wires off of the coils
-1 wire that goes from the relay to the positive sides of the coils

I used a multimeter and turned the bike on and checked for voltage from the starter wire, but did not get any readings, so my guess is the starter....? But common sense tells me I shouldn't get anything from the starter until I push the ignition button. I'm severly disappointed that I've spent a little over 20 dollars on everything to have it all fail.
 
Last edited:
you want the power wire coming straight off the battery, not from the starter...

some people will wire it to the starter cause it may be easier to put it on a post there.. but you want it going to the battery.

you will only get power at the starter post when you hold the start button....
 
Yep, just run a wire directly from the positive terminal of the battery to an inline fuse and then to terminal 30 on the relay. I picked up a Buss brand blade type holder with a fuse for about $5, it had a 30amp fuse which I replaced with 15amp and I think a 10amp would be fine.

I think your ground goes to 85 and the orange wire/s 86 with the wires to the coil + terminals coming from 87. I only used one orange wire and it works fine for me. The other is cable tied to a wire bundle.

Hows it coming
/\/\ac
 
Well I wired it to the battery this time same thing except for a loud backfire. Do my coils necessarily have to be bolted to my frame? Also I'm assuming to attach the wire to the positive terminal of the coil. Are you sure that's the right relay?
 
okay I bolted the coils back up and no change. I used the multimeter and am getting voltage on 87 so something is wrong after that. 87 is simply split into a Y correct? 87 is split into a y with a wire going to each coils positive terminal. What the hell could be wrong now?
 
"What the hell could be wrong now?"

You're correct on the wiring. 87 goes to the positive terminal on each coil.

Double check to make sure you've got the right wires to the right plug. 1 to 1, 3 to 3. Make sure the signal wires are going to the correct coils too.

Could it be flooded? Pull a plug or three and check them out.

/\/\ac
 
Last edited:
I'm going to kick myself if I switched the signal wires haha. Man I've been so stressed out because I just got it inspected and I'm waiting on a title mishap to be sorted out, and now I've killed it, and also gasoline/seafoam mixture didn't work out with my paint job so my tank is horrible looking now.
 
You all have inspired me to do the coil mod. as well. Everything is going well. I am using a Bosch relay but I am stuck. I have #85 to the ground, #30 to the battery, but I am not sure where to go next. On my bike the 1/4 coil has a orange/yellow wire and a white wire. The 2/3 coil has the same orange/yellow wire and a black/white wire. I printed out 2 sets of instructions but I am not sure how to hook up the last 2 connections. Which of these are the kill switch and which are the positive wiring to the coils? I was thinking I should wire the two orange/yellow together, but is that the switch or the power?
My instructions tell me to wire#86 to the kill switch and #87 to the positive wiring to the coils. As you may have figured out, I am no electrical genius. I was not lucky enough to have the 2 loose spade connectors. Mine has a 2 pronged plug going to each coil. One good thing though, they will not interchange so you can't plug them in to the wrong coil.
If someone can point me in the right direction I think I can get this buttoned up and ride tomorrow, if the weather is good.
Thanks for all replies.:-)
 
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