A14: Check Core to Core Insulation

With conditions as A13, measure the insulation resistance between EM013/001 & relay socket pin 5

Is the resistance > 10 M OHM?

Yes
Go to A16

No
Inspect connectors EM013, EM002/009, RH001/011, BT002/006, BT011/001, BT055/002 & BT011/010 for corrosion, damage, bent or pushed back pins & repair as required. Test the system for normal operation