Hey all, I recently made a post about replacing some parts and then having issues. My wagon does run fine but as a student I can't take off to class and risk it dying, so I'm in a Pontiac (Trying to get away from that obviously).

Anyways I kept having an issue with the red/yellow wire from fuse #4 which is the sender unit. What is happening is the red/yellow shows 12v at the connector, but for some reason when I plug it up it is supplying voltage to the chassis. Using the continuity test on my meter I see that the front most wire is a dead short to chassis, thus acting like a ground. So I guess 12v is going through the whole car and making it to the chassis of the pump. Not to sure on that since every other electrical componet is working, but with the connector hooked to the snder unit I can put a probe on it, and anywhere on the chassis and it shows a short with the sender ground removed. When probing just the red/yellow connector at the rear and the ground (without anything connected) it still shows as a short. Doing vintage stereo repair I thought I could figure it out but it seems to be a bit complicated..

Does anyone have any ideas on this or know where this wire runs to? I was considering removing the connector, then running a new wire the length of the car IF this wire is indeed the one that goes straight to the pump. I can't seem to find a detailed schematic on how these cars are wired up. There are plenty of basic schematics but I have yet to find one that is more "realistic" showing the body of the car.

Sorry if this is an odd one. There's no one around who can really help with this and I would guess the closest Volvo specialist is maybe Knoxville or Nashville.

 

Are you referring to the connector in the trunk? The red/yellow wire runs to your in-tank pump and if you measure it to ground, it should measure just ohms - not a dead short. See the link in your other thread for full diagnosis of your in-tank pump.

 

on the side of each fuse in the fuse panel, there's 3 blades. The one farthest to the right and closest to the front of the car is the power input to that fuse, and is connected to the /left/ fuse holder/spring. the middle and left most of the 3 blades are both connected to the output side of the fuse, which is the spring on the right. some of the fuse positions have their input sides tied together, so one input wire feeds multiple fuses.