Fuel pump not working/voltage drop

[JEasterhoff]

I have a 2007 Challenger 1503 SCIC that left stranded on the water. It's a new boat to me so I don't know much about it. The main issue is the fuel pump doesn't come on with DESS attached. I tested, there is 11.3vdc at the connector for the pump, but the battery voltage is around 12.9vdc. I have 12.9vdc at the fuses, so it seems to drop voltage through the wiring harness. I put the fuel pump directly on a battery and it starts up. I have cleaned up the battery connections and the grounds on the block. It helped but I still have voltage drop. Is the pump just wore out? Or is the voltage drop more of an issue? I also found the wires melted on the stator connector so my battery was prolly not charging. Thank you for your help!

 

[Rescue9]

Have you traced the fuel pump wire from the fuse box? Mine got melted on a washer connected to the exhaust manifold. Which caused a short blowing the fuel pump fuse. I ended up replacing the fuel pump before I found the short. Might want to try that first. And if you already have melted wires there may be an issue.

 

[gazzaskirepair]

Get your battery loaded tested
If it has high internal resistance the stator will be provide max AMPs all the time to try charge battery

 

[JEasterhoff]

Well, i cleaned all my ground connections til they were shiny bare metal, it ran out on the lake for one key cycle on the original fuel pump, stopped to swim in a cove and it wouldnt start. Battery voltage was fine, its charging itself etc etc. I spliced and extra ground between the pump and ECM to the block. It runs perfect now, just has a check engine light with no codes. It is a bad idea to run an extra ground like that?

 

[Mister Magoo]

I believe these boats switch the ground. 12v are supplied at all times.