
91subaru-Bruce
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Everything posted by 91subaru-Bruce
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Did they check the electric fan, relay, sending unit? Did they pressure test the cooling system? Is their any exhaust smell in the antifreeze? Coolent hoses in good condition (they will collapse sometimes if old). FYI, you should never remove the thermostat, that's a good way to damage an engine (especially in cold weather). The fact that the mechanic did this as a solution leads me to believe he doesn't fully understand the cooling system. my .02
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Even if it's extra work it'll be well worth the help and the piece of mind knowing that it's not the alternator! I tried to check my mother in laws sub but it has a different plug that doesn't allow me to tap into the yellow lead easily (with it plugged in). I'll check it if the new alt doesn't solve my problems... Looking at the wiring diagram, I was wanting to find out where the ignition relay is. If that was somehow bad it could be leaking power back through the circuit? Not sure where it is though...
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Ok, I pulled the alternator and will get another tomorrow. Then I can at least take that off the list. I'll let you know how that goes tomorrow evening. Hopefully I'll have my little subaru back on the road becaused it's supposed to snow on saturday! Thanks for the continued help. It suprises me how much people are willing to share knowledge on forums!
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Ok, I tested the Alternator yellow wire and yes, the light goes on. Does this necesserally mean the alt is bad?, or could something else be at fault and cause that circuit to be completed (or is that yellow wire never supposed to have power through it even with the ignition switch in the "on" position?) I also pulled every fuse and relay in the two fuse box's and the power never goes out (with the alt plugged in and the ignition switch in the off position).
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Well, out of curiosity I checked my mother in laws subaru to see what had power and what didn't and the yellow wire has power when the key is off as well. So now I'm thinking that maybe my new alt isn't bad (seemed unlikely anyway) Looking at the wiring diagram I still suspect the mpfi diode, but I can't seem to find it. If anyone knows where it is (or at least what it looks like) I'd love to know. The diagram that was posted show's it right near the fuse box under the dash but I can't find anything that even looks close... Still open for ideas on what to check next...
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The fuse (#16) was back in place when I took readings, and yes that was the one that killed the power (when key was in the off postion). Note, the voltage for the leads I posted was with the alternator disconnected (just taking readings from the wires) did you want me to check them when everything is plugged in? (this would be when power is mysteriosly on and the key is in the off postion). Ok - just did, With the key in the off position and everything hooked up on the alternator there is 12 volts to the white, 12 volts to the yellow, and 1.75 volts to the black with white stripe (and also 12 volts to the main white lead that bolts on). Looked for the diode again, started detaching wire harnesses looking for it and still no luck.
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Ok Couger, here's what I got: Voltage on the leads to the alternator Main lead: (two big white wires to single screw on terminal) 12.07 Volts Plug: White wire - 12.07 volts Yellow - 0.00 Black w/white stripe - 0.00 Tested ohms (resistance) with positive on the main lead and negative to all other leads on the alt, all tested infinite ohm(no current through). So the alternator should be ok? I tried to find the mpfi diode, but I can't locate it. The diagram says it's near the fuse box under the dash but I couldn't find anything (and I dug around for a long time). If anyone knows what this thing looks like I'd appreciate it. Diagram says it has two wires going to it, one yellow and one Lg (light green?). any other ideas Couger?
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Wow, you guys are great. I'll try to take all the advice... What I did now is pull fuses until the mystery power went out (alternator hooked up, ignition switch off). When I pulled the "ignition" fuse, everything went off. There is still power to the alternator, and when I turn the ignition switch on I get power like usual (minus things on the ignition circuit). Looking at the wiring diagrams (thanks) the ignition fuse (fuse 16) is tied to the fuel pump relay, the mpfi control unit, "ALT2" circuit, ignition relay, and the A/T control unit. It looks like the two leads to the alternator should have power at all times (as mentioned) so I still don't think the new alternator is bad (edit: realize that doesn't make sense, I guess that power is normal but the alt. could still be bad). Using a multimeter, the alternator is still only allowing current one direction so I think the diode is ok (I checked the one I pulled out and it was shot). So either the alternator went out and took something with it, or something else fried the old alt. I suspect something else fried the alt. and it's backfeeding power through it. I'll see if I can find the mpfi Diode and I'll check that, I also would like to check the ignition relay but I can't seem to find out where it is? I don't suspect the fuel pump relay or the A/T control unit but if someone think they are suspect I'll see if I can disconnect them. Thanks for all the great help, I'm going out to the garage now to see what I can find.
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The voltage is actually on the "plug" (and the main output lead) and everything comes on when that is plugged in (even when the main lead is not disconnected off of the alternator). There are 3 wires that are in the plug, one is a larger white one that has power even when the ignition switch is off (and unplugged). So I'm guessing something is feeding power back through that. Maybe back through the dash warning light circuit? (since all the dash lights were coming on when the problem occured). Tonight I'm going to pull fuses and see if I can isolate a circuit that is the culprit. I'll see if I can test the diodes in the alternator too (the new and the old one). Thanks again for all the help!
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Besides what everyone else has mentioned, take a look at the A/T (if is an automatic) and sniff the fluid. It should be a transparent red and not smell burnt. Most of all take if for a test drive and feel for vibrations, slipping clutch (for manual), hard or slushy shifts (for automatic), rough engine, or pulling severely to one side or another (signs of front end damage). Also ask if it has a clean title (it's not the end of the world if it doesn't, but it's worth less and you need to take a closer look if it does). It's never a bad idea to have a compression check, if you can't do it yourself most shops will do it for around $50. This will give you an idea on how the engine is doing. Good luck!
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Sounds like you just have air in the system that got in when you flushed the system (as mentioned before). Sometimes it can be really hard to purge. I'm not sure about a 98 forester, but look for either a coolant hose on the top of the engine or a plug (sometimes they put purge plugs that are typically plastic) that you can loosen up and let the air out. Another method is to run the engine with the radiator cap off and add water as the engine warms up and the thermostat opens up. sometimes it will burp a little out the radiator, but just keep adding water until its circulating and air stops bubbling out. If it was doing fine before you flushed the radiator I wouldn't suspect a head gasket. If you were having prior problems of overheating and air in the coolent system then you might look into it. It's very important that you don't overheat the engine, keep an eye on the temp and let it cool down if the gauge starts climbing or you feel that things are getting to hot, better safe than sorry.