67 Mustang with 351w dies
06-06-2016, 11:45 AM
#3
Thread Starter
Join Date: Jun 2016
Location: Ga
Posts: 6
i
[QUOTE=Chromeshadow;8547723]Sounds like either the alternator or the battery is going out. Did you check the voltage at the battery when the fan comes on?[/QUOTE
I replaced the alternator last night and still doing it. I just got the car, but everything is pretty much new( radiator,fan, ) . Could it be the relay?
I replaced the alternator last night and still doing it. I just got the car, but everything is pretty much new( radiator,fan, ) . Could it be the relay?
06-06-2016, 03:38 PM
#5
Moderator
Join Date: Dec 2005
Location: Hills of California
Posts: 5,208
Yeah it sounds like voltage sag along an ignition circuit.
You have 12v the fan kicks on and that circuit experiences high current demand (14amps) because of wire gauge, age and corrosion or something like that it can not supply the demanded 14amps because of one of the previously mentioned sources of resistance in the circuit so the result is the Voltage also falling off (sag) and if this happens to be on the ignition circuit that needs 12v it maybe sagging as low as 7 or 8v and the ignition system falls on its face and so does the engine.
The main power wires should run to 1) one of them direct to battery and the other to a relay and then to the battery or solid ground depending on the fan system you have. Neither the heavy gauge + or - fan motor wires should run to any already existing circuit they should have dedicated power from the battery.
You have 12v the fan kicks on and that circuit experiences high current demand (14amps) because of wire gauge, age and corrosion or something like that it can not supply the demanded 14amps because of one of the previously mentioned sources of resistance in the circuit so the result is the Voltage also falling off (sag) and if this happens to be on the ignition circuit that needs 12v it maybe sagging as low as 7 or 8v and the ignition system falls on its face and so does the engine.
The main power wires should run to 1) one of them direct to battery and the other to a relay and then to the battery or solid ground depending on the fan system you have. Neither the heavy gauge + or - fan motor wires should run to any already existing circuit they should have dedicated power from the battery.
06-06-2016, 09:19 PM
#6
Thread Starter
Join Date: Jun 2016
Location: Ga
Posts: 6
Ok, thanks for the replies and you were right. The fan was hooked up with one to battery and to ignition. But the problem I have goes deeper now I've got the fan situated. When the car gets warm, it wont stay running. How many volts should be coming out of the coil ? Reved up, I was getting 4.4 . What do I need to start trouble shooting ? I just got the car and the engine is almost new but wires and a few other things arent
Hell yeah!