Relay for mounting speed regulator. Used to relieve the regulator in cases where a lot of power goes to e.g. solenoid valve or ignition coil.
Important! Note that H-regulator 03-164 must have a separate power supply and not share power supply with ignition coil and relay. This is to minimize the risk of overflow. In a Volvo 7/9 series, it is optimal to use fuse holder no. 12 or 13 for this together with a fuse pin. Only the relay should take power from the old ignition coil current. However, it is important that all components have the same grounding, good chassis ground.