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Yup another ignition relay mod question. Parts List and clarification needed.

  • Thread starter Thread starter AKC75
  • Start date Start date
A

AKC75

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Okay fellas, I have been reading my ass off on Basscliff's website. As my bike runs okay after I cleaned connections in the ignition lines. But I'm not getting the 12 volts to my coils. I'm getting a pretty good drop there. So far I have purchased the 12v/30Amp relay, base connector, female 1/4" spade connectors, a 30 Amp inline fuse holder with 10A red blade fuses.

I've been reading through the PDF. What gauge wire do I need? Does it matter a whole lot? I was thinking 18 or should I go heavier?

Also, I noticed Basscliffs relay mod was different in the fact he actually cut the wires to his coils and connected them together. He also did not have to unravel all the tape that have the O/W wires going to the harness. He cut those and connected them together.

Coil wires to 87 and harness wires to 86. And he's running it down by the battery.

It looks simpler and less time consuming than the PDF linked. Yes or no?

This will be my first ever attempt at rewiring anything. I want to do it the right way, but would prefer to do it in the simplest, most time efficient way as well. Don't get me wrong, I won't be in any hurry.

So this...

My Coil Relay Mod Story - by BassCliff

Under my tank there are two orange/white wires coming out of the wiring harness, one going to each coil. I cut both of them. The two o/w wires that go back into the harness go up to the kill switch. The other side of the o/w wires go to the two coils. On both sides I stripped the wires a little, wrapped them together, tinned them with solder, and crimped them both into a spade connector. Now both of the wires going to the coils are crimped into one connector. Also, the two o/w wires coming out of the harness are crimped into one connector. I poured over the wiring diagram for my bike to make sure it would work this way. It did.

[The following paragraph is somewhat speculative. I'd have to check a wiring diagram to be sure.] Some coil relay mod diagrams show that one of the o/w wires going back into the loom is left unconnected. While this doesn't affect the operation of the relay mod on the coils, it would seem to disable the kill switch. My kill switch still works.

Then I ran 2 wires (both red in my case, you may want to use different colors) all the way back to the relay next to my battery box. I had to be careful to label the wires correctly so that I know which one goes to the coils and which one goes back into the wiring harness.

I took a Sharpie and wrote on the plastic covers of the spade connectors (you've seen them on my r/r replacement guide and such). I came up with a little mnemonic to remember what goes where.

There are 4 connections on the standard relay; 30, 85, 86, 87. The power from the battery gets connected to #30. Then, like the car Mazda made years ago - Mazda GLC, the Great Little Car - I think "G-L-C" for the rest of the connections. G for ground. L for loom (another name for the wiring harness), and C for coils. (+)=30, Ground=85, Loom=86, Coils=87.

In this manner I used my Sharpie to write "+", "G", "L", "C", on the connections at the relay. The connections at the relay are all female spade connectors since the relay has the males. If I ever want to take the relay out of the circuit I can...


  1. Pull the fuse on the hot wire to the battery.
  2. Disconnect the "C" and "L" connections from the relay.
  3. Use my short jumper, with male connectors at each end, to reconnect (C and L) the coil wires back into the harness.
My clutch interlock was not affected at all. I still have to pull the clutch in to start my bike even if it is in neutral.
If everything else is well-maintained in your engine, then even if you have some loss at the coils, there is enough spark to start combustion. But a good, fat spark gives you the most efficient burn. It's usually when the voltage falls below 10v that you really start having problems, especially if there is anything else wrong with your motor. These engines are so well designed that they can take a LOT of abuse before they quit running.

frame_straightening19.jpg



VS this....


http://members.dslextreme.com/users/storagecliff/images/ignition_coil_ relay_part2.pdf
 
There are so many coil relay mod pdf's no one I know can keep track of them all and obviously there are details in any one of them that probably do not apply to your bike. Are you using the PDF at the bottom of your post? IS there a specific question about it?
 
There are so many coil relay mod pdf's no one I know can keep track of them all and obviously there are details in any one of them that probably do not apply to your bike. Are you using the PDF at the bottom of your post? IS there a specific question about it?

That PDF is the one I have printed out and have been reading.

I guess it would help if someone has done this mod on their GS550 in the 80-81 year range and see how they did it.

With all the different methods on different bikes it's leaving me confused on where to start and how to do it on my bike.

Basscliffs method seems different than the PDF version. My question really is what is the best way to do this on my 550T? Will Basscliffs's method work?

Also what heavy gauge wire are you guys using?
 
That PDF is the one I have printed out and have been reading.

I guess it would help if someone has done this mod on their GS550 in the 80-81 year range and see how they did it.

With all the different methods on different bikes it's leaving me confused on where to start and how to do it on my bike.

Basscliffs method seems different than the PDF version. My question really is what is the best way to do this on my 550T? Will Basscliffs's method work?

Also what heavy gauge wire are you guys using?
You should find the schematic for your bike and start there. make it up with a red pen.

http://www.mtsac.edu/~cliff/storage/gs/GS550_77-82_all.pdf


The biggest issue is bad connections and dirty switches so wire is is not an issue. A 16 awg is plenty for the relay 30 (fused source) and 87 (power to IGN).
Modifying your bike is almost identical to the way this is done.

http://www.thegsresources.com/_foru...s1100ez-ed-relay-mod-tips&highlight=relay+mod

http://www.thegsresources.com/_foru...l-Relay-Mod-(with-Dyna-S)&highlight=relay+mod


Look at the schematic for your bike all, the changes to O/W are all done at the right hand switch connector.

You need to O/W output of the kill switch (effectively severing the O/W IGN which you reconnect above) and reroute that to the trigger of your relay.

Where are you going to put the relay? It should be isolated so it doe not see engine vibration.
 
You should find the schematic for your bike and start there. make it up with a red pen.

http://www.mtsac.edu/~cliff/storage/gs/GS550_77-82_all.pdf


The biggest issue is bad connections and dirty switches so wire is is not an issue. A 16 awg is plenty for the relay 30 (fused source) and 87 (power to IGN).
Modifying your bike is almost identical to the way this is done.

http://www.thegsresources.com/_foru...s1100ez-ed-relay-mod-tips&highlight=relay+mod

http://www.thegsresources.com/_foru...l-Relay-Mod-(with-Dyna-S)&highlight=relay+mod


Look at the schematic for your bike all, the changes to O/W are all done at the right hand switch connector.

You need to O/W output of the kill switch (effectively severing the O/W IGN which you reconnect above) and reroute that to the trigger of your relay.

Where are you going to put the relay? It should be isolated so it doe not see engine vibration.

I have my Clymer manual. But to be honest. When I look at a wiring diagram I get all dyslexic! Haha

Well my original plan was to drill the mounting hole on the frame by the coils per the PDF. But then I was thinking somewhere around the fuse box area and run the ground to the frame where the rear brake master cylinder is.
 
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