Quick bump, I have followed the last diagram in this topic as well as checked other wiring diagrams and confirmed manufacturers diagram with no luck. Ive killed two SSR so far, at first thought the first one was faulty so exchanged but the second is the same. Runs for 5mins, then pumps start surging, Led flickers and it burns out going normally closed shorted and pumps run til the battery is disconnected. Pulled it apart and the diode is burnt out. Relay is the typical 100A item in the diagram above, running 2x Walbro 460 fuel pumps. Link output to the negative terminal of control side is set to Fuel pump speed as advised. Any clues?