Back in the 1960s, and possibly the early ’70s, Lucas Electric Limited of England issued these test cards to assist owners of British-built cars and trucks with any electrical problem they may encounter. Be it Lucas electrics, or Autolite, Delco, Bosch, and Magneti Marelli, all automotive electrical systems, regardless of where they are manufactured, do fail every now and then. Having these test cards on hand helped many car owners diagnose those problems.

I recently received these four Lucas Test Cards in the mail from Jeffrey Miller, the son of the previous owner of my 1967 Triumph GT6, who’d found them while cleaning out his father’s garage. Each test card measures 6-inches wide by 4.25-inches, and opens to a full 16.5-inches. Printed on stock similar in thickness to a postcard, they are coated to protect against dirty fingers while in use.

DIY throwbacks from before the time of the internet.