How does the Evinrude trigger base sensor work? I have a 1972 100 HP 100293R

[rs2k]

I'm trying to figure out how this sensor works. I get 5 ohms when I check the resistance which is the correct number. When I hook a volt meter up to the sensor and crank the engine I only get between 2 - 6 mV of AC energy while a normal VR sensor usually puts out 600 mV at cranking speed. Is this sensor something other than a VR sensor?

 

[F_R]

Re: How does the Evinrude trigger base sensor work? I have a 1972 100 HP 100293R

As I sort of understand it, which may be in error, the sensor is an electromagnet device and the rotor interrupts the magnetic lines of force, which the pulse pack is able to detect. Sorry, I can't be more engineering-savvy.

Newer motors' sensors generate electricity when magnets pass by them.

This advice is worth every penny that you paid for it.

 

[clanton]

Re: How does the Evinrude trigger base sensor work? I have a 1972 100 HP 100293R

Use a peak reading meter to get output voltage. Somewhere between 1-5 volts with this meter. Using a mutilmeter set on AC scale X the results by 4.414 for a close reading of output voltage.

 

[F_R]

Re: How does the Evinrude trigger base sensor work? I have a 1972 100 HP 100293R

May I expand on my limited answer? Electricity is generated when a coil of wire is moved through a magnetic field. Or a magnetic field is moved past a coil of wire. Same thing. The key word is "moved", or more precisely "changing" of the magnetic field past/through the coil of wire. On the subject engine, a magnetic field exists around the coil of wire and the non-magnet iron sensor rotor changes the magnetic lines of force around the sensor coil as the rotor lobes pass by.