Draw tite brake controller after Appying the brake will go to set gain then say OL ..NOW controller has the Er after turning power off truck...Has any one experience anything like this ??? Thanks in advance !!
From what I have read, OL means just what you would think it does, OVERLOAD. You need to check all the brake (blue) wiring for a short circuit. E.R means the brake controller is inoperative and needs to be replaced. Find the short before you replace it or you will be replacing it again.
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