Relays

DEcosse said:

The relays which are connected to the ECU (EMS, Fuel Pump, Fan) are designed specifically for use with ECU and have special Suppression design to protect the ECU from damaging spikes during turn-off.
This is one area it would be advisable to stick with OEM spec for these components.

Click to expand...

DEcosse said:

Relay is cheaper than an ECU

So, you know how your ignition coil works, yes?
You 'charge' up the coil then, when you 'open' the connection you get a huge high voltage discharge through the spark plug
Well, a relay coil does exactly the same thing - smaller coil of course, so the 'charge' potential and resultant discharge is less than your ignition coil - however easily still potentially couple of hundred volts.
You really do NOT want that energy discharging through your ECM
Trust me - if Triumph was confident in using a cheaper relay, they most certainly would!

Click to expand...

The Need for Transient Suppression
When an electromechanical relay is de-energized rapidly by a mecanical
switch or semiconductor, the collapsing magnetic field produces a
substantial voltage transient in its effort to disperse the stored energy
and oppose the sudden change of current flow. A 12VDC relay, for example,
may generate a voltage of 1,000 to 1,500 volts during turn-off. With the
advent of modern electronic systems, this relatively large voltage transient
has created EMI, semiconductor breakdown, and switch wear problems
for the design engineer. It has thus become common practice to suppress
relay coils with other components which limit the peak voltage to a much
smaller level.

Click to expand...