Technician a says that a good relay should measure between 60 ohms and 100 ohms across the coil terminals. technician b says that ol should be displayed on an ohmmeter when touching terminals 30 and 87. which technician is correct?

Both technicians are correct.

Explanation:

A working coil in a relay can measure resistance between 50 an 200 ohms.

And the terminals in a Relay are the next, considering the German International Automotive industry standard DIN 72552:

85 Coil

86 Coil

87 NO Normally open

30 Common

So Measuring between terminal 30 and 87 must be an open circuit, and the ohmmeter must show infinite resistance or "OL".

explanation:

could i give you a exaplo that could you?

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .