Chrysler Repair: engine fuse (#17) blows: 99 minivan, plymouth grand voyager, alternator wiring

Question
Hello, my problem is that I have a 1999 plymouth grand voyager and it has a 6cylender 3.3liter flex fuel engine and I had recently had my wiring done to my alternator and since tat my van wont start. It will try to crank but wont turn over. My husband noticed that the engine fuse was blown and he changed it. The van started up and was running fine and when I drove it it shut off on me and each time we tried ti put a new fuse in it we just turned it half way not all the way on the fuse burned out everytime. So if u can please tell me what u think our next step should be.

Answer
Hi Patrice,
I suspect that whoever did the alternator wiring may have goofed. The engine fuse 'feeds' current to a dark green/orange wire from the middle pin (87) of the automatic shutdown relay (the front relay in the power box under the hood) and that same color wire is found at the alternator for the operation of its field coil. Of course the field coil itself may be shorting to ground.  
To test my theory you could disconnect that wire at the alternator and then see if the engine will start and run without blowing the 'engine' fuse. If so, then the field coil of the alternator is shorted to ground. If it still blows then either the alternator wire that was 'done' is shorted to ground OR one of 5 other same color wires that go to the coil pack, the 2 heated oxygen sensors, the fuel injectors, or the engine control module is shorted to ground (or one of those components is shorted ground). It can be diagnosed if that latter is the case by means of an ohmmeter or by disconnecting one at a time one of those other 5 components and use fuses to see which one, when disconnected, allows the fuse to not blow. If you need more details please ask a follow-up question. My suspicion if it isn't the alternator wire or field coil would be one of the oxygen sensors because those have very fragile wires which are subject to breaking and then shorting. You can inspect at each sensor to see if that might be the case.
Roland
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