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<blockquote data-quote="keep_hope_alive" data-source="post: 8126542" data-attributes="member: 576029">for the benefit of others: your thought with the diode is so the cap is not used by the rest of the vehicle.&nbsp; it would need to be a 40-50A diode to be reliable, and you would need to intercept factory headlamp wiring (cut).&nbsp; These diodes are around $25-30.&nbsp; Figure another $50-100 for the cap (new) and you are taking a chunk out of a H.O. alt purchase.I agree it would likely resolve dimming that occurs in pulses, but it will not resolve dimming that is sustained.&nbsp; sustained dimming will still cause the voltage to drop and remain lower.a good H.O. alt will be able to keep up with demand and resolve dimming by keeping voltage above 14V.if you experience dimming between 14.4V and 14V, then tough shyt. The A/C will cause that drop as well and some cars have dimming issues from the factory based on fuel economy designs (*ahem* Honda).a second battery will not resolve headlight dimming.an H.O. alt can, if large enough.a 500F-1000F cap bank can if the problem is pulsation and not sustained.HID is a valid idea since the driver isolates the lamp.</blockquote>

[QUOTE="keep_hope_alive, post: 8126542, member: 576029"] for the benefit of others: your thought with the diode is so the cap is not used by the rest of the vehicle. it would need to be a 40-50A diode to be reliable, and you would need to intercept factory headlamp wiring (cut). These diodes are around $25-30. Figure another $50-100 for the cap (new) and you are taking a chunk out of a H.O. alt purchase. I agree it would likely resolve dimming that occurs in pulses, but it will not resolve dimming that is sustained. sustained dimming will still cause the voltage to drop and remain lower. a good H.O. alt will be able to keep up with demand and resolve dimming by keeping voltage above 14V. if you experience dimming between 14.4V and 14V, then tough shyt. The A/C will cause that drop as well and some cars have dimming issues from the factory based on fuel economy designs (*ahem* Honda). a second battery will not resolve headlight dimming. an H.O. alt can, if large enough. a 500F-1000F cap bank can if the problem is pulsation and not sustained. HID is a valid idea since the driver isolates the lamp. [/QUOTE]

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