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Paul, some ballasts can let through a pretty significant init amount of current to ignite the xenon. Have a go at it on the work bench using a DC power supply and measure what sort of current you are getting at init with a DMM (provided your DMM is fast enough to catch it). If +7~8 amps then that old cabling gauge/size might be the culprit, although I believe the cabling is rated 15 amps.
As benchmark; your old ballasts are 4.75~5A init and then settle to 2.6A within less than a second.
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
Last edited by Nine8Six; 02-19-2020 at 10:48 AM.
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