Headlight no power

[ridon29]

V11 would not start so I replaced the relay & it started. Now no power to headlight, rev counter and ignition red light. The instrument and rear light work fine. I have checked fuses.... am I missing something obvious?

[Kiwi_Roy]

Did you happen to replace the original 5 pin relay with a 4 pin variety?

The start relay needs to be 5 pin, when it's not energized it powers the headlight relay and

all the other items you mention.

BTW, the battery will not charge either so don't be tempted to ride too far.

 

Here's a link to Carl's schematic

http://www.thisoldtractor.com/guzzi007/schematics/1999_V11_sport.gif

 

And mine showing a bit less detail

Guzzi Wiring - Simple.pdf

Fuse 5 on the left goes to the Start Relay R1 and to the starter solenoid while cranking or

to the Headlight relay R2 when the start button is released

[Chuck]

Did you happen to replace the original 5 pin relay with a 4 pin variety?

The start relay needs to be 5 pin, when it's not energized it powers the headlight relay and

all the other items you mention.

BTW, the battery will not charge either so don't be tempted to ride too far.

 

Here's a link to Carl's schematic

http://www.thisoldtractor.com/guzzi007/schematics/1999_V11_sport.gif

 

And mine showing a bit less detail

Guzzi Wiring - Simple.pdf

Fuse 5 on the left goes to the Start Relay R1 and to the starter solenoid while cranking or

to the Headlight relay R2 when the start button is released

 

Your explanations are invaluable, Roy.. thanks!

[ridon29]

Did you happen to replace the original 5 pin relay with a 4 pin variety?

The start relay needs to be 5 pin, when it's not energized it powers the headlight relay and

all the other items you mention.

BTW, the battery will not charge either so don't be tempted to ride too far.

 

Here's a link to Carl's schematic

http://www.thisoldtractor.com/guzzi007/schematics/1999_V11_sport.gif

 

And mine showing a bit less detail

Guzzi Wiring - Simple.pdf

Fuse 5 on the left goes to the Start Relay R1 and to the starter solenoid while cranking or

to the Headlight relay R2 when the start button is released

There was a 4 pin relay when I bought bike ... is this incorrect? I have both 5 pin & 4 pin relays . Thanks for your help

[Kiwi_Roy]

The only relay that needs 5 pins is the Start Relay, the front one on my V11

 

All the others only use the Normally Open contacts 30 & 87 so you can use 4 pins everywhere but start relay.

 

Most riders replace all the relays with the 5 pins variety

 

I think the relays get a bad rap, sometimes it's the relay base connectors spread apart. I have a theory by swapping the relays around the pins get a scrape and make contact for a while. I wipe the pins with a little petroleum jelly aka Vaseline to stop them corroding.

If your old relay is bad you could break out one the pins and use that to test how much grip each base contact has. Relay Base Repair.pdf

Shows how you can remove the base contacts to tighten them.

 

If you have a multimeter a relay should read 0 Ohms between pin 30 & 87A and around 100 - 120 Ohms across the coil pins 85 & 86. Connect 12 Volts across the coil and you should hear a nice healthy click then the contact will change and you get 0 Ohms between 30 & 87 (refer to the drawing I sent previously, it shows the pin arrangement)

 

Once the bike is running and off the prop stand only relay 4 & 5 are required.

Update (to make the engine run that is)