Mystery Charge Fault Error-Partly Solved
Thread Starter
4th Gear
Joined: May 2022
Posts: 4
Likes: 0
Mystery Charge Fault Error-Partly Solved
OK so I have been dealing with the P1637 code. Battery is not charging, upon startup with no accessories running I am at about 13.6V. After driving around etc itll slowly drop to 12.6-12.8, clearly running off of battery power.
Now here is what I do know:
Valeo alternator tested great at an alternator rebuild shop
Battery is brand new and I thought that might've been the issue after sitting for 2 weeks but I replaced it and same thing.
In terms of the wiring diagram PIN D or the "S terminal" wire coming out of the alternator connector is reading 0 volts with the key out and with the key on, from my understanding its always supposed to be hot. I stuck a lead in the wire and the other to a ground and got 0.
My starter is original, and the nuts/ lugs look slightly corroded, it is already pulled and am planning on replacing the starter/ cleaning the connections.
My current plan of action and theory is, if the S terminal wire on the connector (closest one to the engine) is reading 0 volts that means that the fusible link is bad (small red wire that switches to a gray color at the starter). I am planning on just leaving the old wire disconnected and splicing in a new fusible link for the S terminal wire going to the starter.
Am I missing anything or misinformed?
Now here is what I do know:
Valeo alternator tested great at an alternator rebuild shop
Battery is brand new and I thought that might've been the issue after sitting for 2 weeks but I replaced it and same thing.
In terms of the wiring diagram PIN D or the "S terminal" wire coming out of the alternator connector is reading 0 volts with the key out and with the key on, from my understanding its always supposed to be hot. I stuck a lead in the wire and the other to a ground and got 0.
My starter is original, and the nuts/ lugs look slightly corroded, it is already pulled and am planning on replacing the starter/ cleaning the connections.
My current plan of action and theory is, if the S terminal wire on the connector (closest one to the engine) is reading 0 volts that means that the fusible link is bad (small red wire that switches to a gray color at the starter). I am planning on just leaving the old wire disconnected and splicing in a new fusible link for the S terminal wire going to the starter.
Am I missing anything or misinformed?
Safety Car
Joined: Mar 2017
Posts: 3,771
Likes: 940
From: Orlando Florida
Voltage readings from a good battery source, or from reading the DIC? The DIC is pretty well known to provide inaccurate voltages.
Seems that even the low cost blue tooth OBD2 scanners will report system voltage live (although by no means should you be looking at the phone while driving) which would be an interesting comparison.
Seems that even the low cost blue tooth OBD2 scanners will report system voltage live (although by no means should you be looking at the phone while driving) which would be an interesting comparison.
