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coil relay mod

You don;t have to clean the kill switch contacts or the ignition switch contacts.

Many riders like the idea of sending 12 volts straight to the coils from the nearby battery rather than let the power go through the above switches and a few connectors. These parts get corroded and drop the voltage. The best solution is to fix these problems rather than bandaid them since these problems can affect other areas as well, such as lights and blinkers.

Some have reported the relays going bad prematurely, stranding the rider.
 
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As duaneage mentioned, the primary purpose for the mod is to ensure full battery voltage at the coils. Due to corroded connections, it is entirely possible to see only about 10 or 11 volts at the coil terminal when the bike is running. However, when you start the bike, voltage can drop to 8 or so, and the bike just will not run under those circumstances. By doing the mod, whatevery you have available at the battery is what will be delivered to the coils. You can use the corroded connections with the reduced voltage to adequately trigger the coils, so it is really a rather easy mod to do.

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It is also relatively easy to clean the associated connectors that can cause the problem. There are good reasons to use relays, working around problems with corrosion does not seem to be one of them to me.

Search for the phrase Coil Relay Mod and you can find the diagram and complete instructions on wiring it. I understand some bikes run better with it.
 
For all of the reasons above, and to resolve the matter of the longer length marginally sized wire in the original harness which also causes a voltage drop.
 
Talking from recent experience. Mine started well before the mod but starts even quicker now, especially when cold or after extended periods of not being run. FWIW, I cleaned every connector and switch in the circuit before installing the relay. My hope was to avoid installing the relay. The new wiring, with relay, definitely improved the start-ability. Just my .02 worth.
Willie in TN
 
If you have good voltage at the coil there isnt any advantage to it. Not a one of my Z1's or KZ1000s did. As far as leaving you stranded a simple jumper wire with alligator clips in the tool pouch will get you home.
 
I keep a spare relay on my bike in case some thing goes wrong. 10k Km's and no problems with my $5 relay so far.
 
I am going to test voltage and see what i got,starts up just fine but If its better set up will do the mod.Do you use spade connectors or a plug of some sort
 
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