Near Intersection of I-35 & I-90 Southern Mn. | As I started to read your post I immediately thought of the relays that I would use in such a situation. As I scrolled through the posts I noticed a picture of a sealed type relay. We used relays of this style (Hella) for heavy duty situation and got the various pieces from Waytek (waytekwire.com). These relays would not require an enclosure although you might still want one.
As I recall they can be purchased partially assembled with pigtails or bare where you buy the terminals and solder them on to your harness. As I recall the relays are a Single Pole Double Throw type so they could be used for logic reversing by using the Normally closed terminal if desirable.
As you have already stated you will need to feed them with heavy wire or split them into pairs to run directly to the battery.
Edited by tedbear 5/21/2013 07:08
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