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So, I still don't get it. And, Bruce, I'm certainly not saying you're wrong (read on and you'll see why), but I just can't make this #6 fuse thing make sense to me (I know trying to make sense of a Volvo electrical system is a quixotic quest at best, but...). Here's what I found out:
1. As ascertained before, the fuse panel label says #6 is for the main fuel pump relay (not the pump itself). The owner's manual agrees.
2. The diagrams in Haynes show that the pwer comes directly from the battery, through the junction block under the hood to the #6 fuse. From there, it goes to the #4 fuse and on to the in-tank pump, the ignition system brain, the FI brain and the main fuel pump relay. When the relay is active, it completes the circuit directly to the fuel pump. Effectively, then, it shows the #6 fuse as bein between power and pump.
3. I stopped by two Volvo dealers today in two different states (not the only purpose of my trip--I'm not quite that obsessive). At one, I asked the service guys, and they all concurred that #6 is for the fuel pump relay. At the other, I just asked to see the wiring diagrams in the Volvo service manuals. As I suspected, the diagrams in Haynes are reprints of the Volvo diagrams (not at all unusual). Another image in the Volvo service manuals shows the power flow throught the #4 and #6 fuses, and it concurs with their stated purposes.
4. BUT-- on Bruce's admonition, I looked at my own #6 fuse with the kick panel removed. It really did not seem to have anough wires hooked up to it. Just one red one. So, I checked the voltage on the red wire at the relay. 12.56 volts. Then I pulled the #6 fuse. 12.56 volts!
So, all I can conclude is that all of the sources do not agree with my observations of reality. Again, I understand that tring the apply reason to Volvo electricals is a fool's game, but I just don't understand why all of the sources I consulted would be wrong. I also don't understand why Volvo would leave such an important circuit unfused, or why they would put a fuse there, hook up a wire to it (either from power or to some device), then leave it hanging.
Can anyone out there relieve my burning curiosity as to the underlying logic, or lack thereof, of the whole thing?
-EdM.
'90 240DL Wagon "Lola"
'72 1800ES "Galadriel"
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