[Tigers] heater blower motor

[Dave Munroe]

Hi Steve;

I hope this file comes through ok. Relay circuits are incredibly simple. The 
way the Tiger left the factory, power was supplied to the switch, and when 
the contacts were closed, the power was fed to the heater, headlights, etc. 
This put a lot of resistance in the circuit, with the really weak link being 
the contacts in the switch.

When you introduce a relay to the circuit, all the dash-mounted switch has 
to do is pass enough current (much less than it takes to run the heater, for 
example)  to throw the switch in the relay, which brings together much 
heavier contacts that send current down a dedicated wire directly to the 
heater motor from the power supply.

There is a complication with the Tiger: because it has a low/high switch 
position, you either have to use two relays, or just put the relay on the 
"High speed" circuit, and don't use the low speed circuit, which is what I 
did.

Check out the wiring diagram, and get back to me if you have any questions..

Cheers,

Dave



> Hello Dave:
> Can you explain in a little more detail what you did....where the replay 
> is in line with the heater, dash switch, etc.? I want to do that too on my 
> puny heater motor.
>
> Thanks!
> Steve Sage

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