Load Relief Relay

[zeltus]

My start motor has packed up. The tinplate cover betwixt the armature and the planetary gears came loose, rubbed against the copper wiring and shorted everything out.

The symptom was a very dull glow from the dash bulbs and a nasty buzzing noise form the general area of the relays.

I have stripped and cleaned the motor but I can't get it to spin on the bench. But no real problem, as http://www.ebay.co.uk/itm/Anlasser-...pt=Motorrad_Kraftradteile&hash=item4aba16ab20 seem to be readily available.

A check of the starter relay a la Haynes manual passes - but I am not so confident about that test, mebbe I will get one of them as well. Just in case. Expensive, aren't they?

But how does the load relief relay work? What triggers is? Where does it send the load to? Is magic involved, or discworld imps with shovels throwing the electrons away as fast as they can?

Thanks

Bill

 

[oblertone]

It's a box ...

... that temporarily holds all the smoke while you start the bike. If you've ever bothered to look, when you press the starter button everything else is momentarily turned off so only your starter, well not yours because that's fecked, but everyone else's starter, who's trying to start their bike, with an electric starter and not a kick starter, gets the smoke. All other smoke is retained in the box until the bike is running, but yours isn't, if you see what I mean

 

[Ian J Hartley]

The load relief relay coil has one side connected to the positive from the ignition switch, and the other side to the starter motor via the single black wire. The current path is through the coil of the starter motor to ground. So when you turn on the ignition, the load relief relay energises.

When you press the start button, the start relay puts positive to the same black wire on the starter motor. This causes the starter motor solenoid to energise. Because you have now got positive on both sides of the load relief relay coil. It deenergises chopping all the circuits to remove the load from the battery.

Does this make sense. The load relief relay will not work unless you have a starter motor installed with the small black wire connected.

 

[Ian J Hartley]

To check the starter relay is working. Connect a voltmeter or test lamp between the small black wire of the starter motor and ground.

With the bike in neutral and kill switch off press the start button. The test devise will show 12volts.

Put the bike in gear and pull in the clutch. Press the start button again, and the test device should show 12 volts.

This tests both circuits of the starter relay.

 

[Ian J Hartley]

If you want to test the starter motor on the bench, you must make sure that you have the large connection connected to positive and the case of the stater motor to ground ( using jumper leads for current ) but you must also connect a wire from the small terminal (where the small black wire connects ) to the positive to energise the coil.

 

[zeltus]

Aah I see. Thanks for the explanations. Altho' I am still not sure where the imps live. But so long as what they smoke isn't illegal, I won't worry.