Richardsmack Posted March 22 Share Posted March 22 (edited) Hi All, It's been a while but I still have my 1998 RD688 E7 350. Yesterday I came across a strange problem with my dash electronics and starting the truck. Today again I broke my head figuring it out. Mybe you can help me in the right direction to fix it..... So yesterday I charged the batteries (one by one disconnected from the truck) as it was sitting over the winter. When I tried to start it it would run for a second and then die. I noticed the dash power to the fuel gauge, parking brake light, and heater blower stayed on while the key was in the off position. Tested the switch which was fine. Just in case I used a wire instead of the ignition switch.. same thing If I put the switch on contact the fuel gauge etc go on. When I put the switch in the off position power stays. Looked at the relays. they work fine. I took them out when the ignition was off but still had power as by pushing in the relays back in the fuse box I could hear click. Now when you actually turn the key further to start it it will fire but then dies and when the key is put in the off position the everything goes off like it should. I checked for ground issues etc but could not find anything. One thing is I'm not sure of see picture. Black box under starter relay with the little screw in the middle. Whenever I turned the truck off the gauges etc would stay on for a second or 4 and then turn off. Would it be the black box? What is it? (i found it it's a circuit breaker 105 amp) Thanks for your help 🙂 Edited March 29 by Richardsmack found black box Quote Link to comment Share on other sites More sharing options...
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