1969-70 Pontiac Ignition Switch

In 1969 and 1970, Pontiac used 2 unique ignition switches, one for tilt and one for non-tilt. The other divisions also had 2, tilt and non tilt as well. The Pontiacs were unique in that they were different than all other GM lines as they had 1 extra blade on them. The Pontiacs all had an extra cavity in the clear connector at the switch and that extra blade on which to plug that cavity. It is the resistor bypass circuit and must be used or the car will not start in most instances. That particular blade sends a 12v signal to the coil when cranking the car. The pink ignition circuit plays to the coil through a resistance wire and only delivers about 9 volts to the coil which will generally not be enough voltage to start the car. The car runs on between 9.0 and 9.6 fine, but needs 12-14 to start. Unfortunately, the Pontiacs used a starter without a bypass circuit and took their bypass feed directly off the ignition switch. The dash harnesses in these cars are wired accordingly. You MUST use that yellow wire, and have a switch for that wire to plug onto or the car most likely will not start. Once in a great while, an engine will spin freely enough that once you get the engine turning over and release the key, it may catch and start, but that is an extreme exception, not the rule.

In conclusion, you will need to find a PONTIAC ONLY, TILT ignition switch to bolt onto this column, or the column will be useless in your car. The Pontiac non-tilt switch will not work on a tilt column either. Unfortunately, neither of those switches are commercially available any longer either. The switches listed and sold in many repro catalogs are really for a Chevy, Olds, Buick, etc. application and as such, DO NOT have the extra blade needed in the Pontiac application and will NOT WORK with a Pontiac dash harness and electrical system. Most likely, the only way to get one of the correct switches, is to find a good used or NOS one.