1989 volvo 240DL converted to a manual 4spd with electronic OD


Basically my OD, windows and rear defrost fuse keeps blowing (No. 12 i think??). I will replace the fuse and drive 15min home and the fuse will blow randomly. It's never when I'm using anything on the circuit even. I will engage and disengage OD, roll windows down and up, and the fuse will blow when I'm nearing my house for no apparent reason. I have not been able to find any problems with wiring or shorts so my next plan was to isolate each element on the circuit. I wanted to run individual fuses to each element and see if one is causing the blow. My problem is that I can't figure out how to run (if I even can) power to the OD with it's own fuse.

Here's what I've done so far (just so I can roll down my windows and use OD on the highway to work)

I ran power from the battery side of the terminal with an in-line fuse to a switch that sits next to the hazards and then ran power back to the other side of the terminal so that I can engage give the circuit when I want. This allows me to use the windows and OD. I figured since it was a random occurrence I could lessen the time the circuit has a chance to blow. I would like to run a separate power with an in-line fuse to the OD so it operates on a its own circuit in case the main one blows. Is there a way to do this? I'd basically like to take the OD off the main circuit and isolate it so it functions, and so i can see if it is the problem.


Thanks for the input

Khu

 

if you're blowing fuses, chances are there's an intermittent short somewhere in the wiring harness.