Grandpa Posted March 28, 2015 Share Posted March 28, 2015 The stop lights are difficult to see on my 1941 Buick on a sunny day. The outer plastic red lens (the outer "lens" is actually a red filter and not a true lens) and the inner plastic clear Fresnel lens are both in excellent condition. Also, the stop light switch is new. There is a long length of wire to the back of the car, so the voltage drop is the problem for the original 6 Volt system. My concern is the brightness of the stop lights and not the brightness of the tail lights or the turn signals. I have tried LED bulbs and higher wattage (6 Volt) halogen bulbs with less than satisfactory results.My solution to this problem is a simple one: Install a 1½ Volt dry cell battery wired in series in the stop light circuit. This can be done in a few minutes, as the stop light switch is readily accessible under the steering column. I secured the battery with tie wraps to the windshield washer bottle holder (which is nearby). The dry cell battery can be removed quickly for a car show event. I installed the battery on the powered stop light wire so that the circuit is protected by the existing fuse. The increase in the stop light illumination is noticeable, but not dramatic. I expect that the dry cell battery will last several years. The battery was purchased from McMaster-Carr.The stop light bulbs (#1154) are rated at 6.4 Volts. I estimate that the actually voltage at the stop light bulb, when illuminated, is about 6½ to 7 Volts. I doubt that the increased bulb heat would cause damage to the plastic Fresnel lens.Grandpa Link to comment Share on other sites More sharing options...
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