R24200

120A - 200A relays (12V or 24V)

where cost is the overriding factor then simply fit a relay with a direct ignition feed, no frills.

Part Number                           R24200
Coil nominal V                           24
Contact current rating A           200
Active switching current A        200
Active switching power W        2800                                   
Coil rating  continuous W         2.4

Ignition Voltage required       16.0V - 31.0V
Ambient rating deg C             -40 - + 85
Relative humidity                     85% at 40 deg C
weight                                      90 grams