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There is a diode in the excitation wire to prevent the back-feeding of current, & the problems this can cause. Just plug the anti-feed-back lead into your alternator & plug in the original harness, or splice it into your harness.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.