Bliue dm Posted October 13, 2020 Share Posted October 13, 2020 with negative wire unhooked from all four batteries..... test light hooked to negative terminal on battery checking negative cables.... test light lights up. All wires on the strip have power ( which they shouldn't). When i disconnect this i lose power or (short) on my ground. What is this box for ? Quote Link to comment https://www.bigmacktrucks.com/topic/64566-constant-draw/ Share on other sites More sharing options...
fjh Posted October 13, 2020 Share Posted October 13, 2020 (edited) Ground fault breaker there should be know power to that box whatsoever! it will only light a test light across it if it is blown! Edited October 13, 2020 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/64566-constant-draw/#findComment-462326 Share on other sites More sharing options...
Bliue dm Posted October 13, 2020 Author Share Posted October 13, 2020 ok...with ground wire disconnected from all batteries. With test light hooked to ground terminal on battery... I'm getting power at three wires attached to left side of box. Is that because its just searching for a ground at that point? If i hook test light to ground terminal on battery snd then to ground wire thats suppose to be on terminal i have power. If i disconnected that box i lose the power on ground side. Does that mean that box is bad. I also have power to wire tree on all wires on left hand side with key off. Relay in dash is wrking to par. Cab fan turns off with click in dashboard Quote Link to comment https://www.bigmacktrucks.com/topic/64566-constant-draw/#findComment-462347 Share on other sites More sharing options...
Bliue dm Posted October 15, 2020 Author Share Posted October 15, 2020 There is no power to box.. still very bad draw on batteries. Quote Link to comment https://www.bigmacktrucks.com/topic/64566-constant-draw/#findComment-462434 Share on other sites More sharing options...
doubleclutchinweasel Posted October 15, 2020 Share Posted October 15, 2020 (edited) A couple of dumb questions. 1. What truck is this on? 2. What kind of system are we looking at (neg ground, pos ground)? Maybe, if we know about what you're working on, we can help more. But, here are a few things to think about. Sometimes, the best way I have found to troubleshoot electrical systems is to start disconnecting individual systems/circuits (regulator, generator, ignition switch, etc.) and see if the situation changes. I have seen a bad voltage regulator bleed one dry in no time. Disconnecting it stopped the bleeding. Maybe you can disconnect a terminal at a time from the junction box and see what happens? Edited October 15, 2020 by doubleclutchinweasel Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/64566-constant-draw/#findComment-462435 Share on other sites More sharing options...
fjh Posted October 15, 2020 Share Posted October 15, 2020 I would be tracing the main starter wire they could be rubbed thru in the bellhousing or starter as stated start by disconnecting stuff in order back to front !Start at he source and move forward! Quote Link to comment https://www.bigmacktrucks.com/topic/64566-constant-draw/#findComment-462437 Share on other sites More sharing options...
fjh Posted October 17, 2020 Share Posted October 17, 2020 Did you get this sorted out? Quote Link to comment https://www.bigmacktrucks.com/topic/64566-constant-draw/#findComment-462573 Share on other sites More sharing options...
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