Accordingly, the multiple connections and switches in your vehicle’s start circuit have less detrimental effect and the Ford solenoid will operate more dependably. As the Ford solenoid is only designed to operate a high current switch through the large posts, and does not have to throw the starter drive into engagement as does the Delco, it requires much less electrical power than the Delco. Use appropriately sized terminal lugs and carefully crimp or solder the wires into the terminals. Using 12 gauge wire, connect the other large Ford solenoid post to the positive battery cable connection of the Delco solenoid. Remove the factory wire from the “S” terminal (usually purple) on the Delco solenoid and reconnect it to the small positive coil terminal on the Ford solenoid. If in doubt, run a ground wire directly to the rear of the engine head. Assure it is grounded, or it’s negative coil terminal is grounded. Mount the Ford solenoid securely to the firewall somewhere around the master brake cylinder. The situation becomes more serious when the solenoid heats due to engine/manifold/heater heat, because a hot solenoid needs even more voltage to operate. Each wire or switch connection will tend to drop some voltage due to wear and tear and/or corrosion, the bulkhead connections heat and expand, the neutral start switch becomes worn and the result is less than optimum voltage at the solenoid coil. The idea is to eliminate the voltage dropping effects of all the “start” circuit connections through the firewall (bulkhead), ignition switch, Neutral Start position, and unknown lengths of wires connecting them. If you have an erratic starter solenoid due to heat, a correctly installed Ford solenoid will provide maximum power to the Pontiac Delco solenoid energizing coil (“S” terminal). Note: You may wish to review last months column on Pontiac Starting Systems for clarification on some of the following listed components’ operation. This writer may now take a break from an issue or two. This results in a longer than usual column. The three subjects are closely related and were deemed advisable to print them together. We have three tips for you in this issue: How to minimize failure of your starter solenoid under high heat conditions, improving cranking with trunk mounted batteries and how to meet the NHRA requirement of a positive shut-off of your engine with the master disconnect switch.
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