Locate the amp rating for the accessory you are going to install. This is the amperage the accessory is rated for and it is only safe to use the accessory at or below this rating. Amperage ratings are listed in the accessories manual near the beginning of the installation section.
That's right. Now you have isolated the problem to the relay and only two things can be wrong: either the relay's coil isn't energizing (due to an internal broken wire) or the high-current contacts are being drawn together but no current is passing through (remember high-resistance connections?). If the coil is bad the relay must be replaced. If the contacts are charred, file them smooth.
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