@Royce
Thanks for the reply.
I’ll do that, but before I do I want to give a little more information.
I just took her out for a ride.
The alternator light is still blinking / flashing like a turn signal while driving.
BUT…
When I turn on the turn signals. 4-way flashers, headlights, heater fan, and when the brake lights come on it immediately stops.
I’ve never had something like this happen…weird.
Just wanted to put that out there to see if that helps.
Thanks
Tony
I finally found time to remove the alternator and have it tested.
They said it’s working.
See picture.
I’m guessing the next step would be the voltage regulator??
EDIT: I noticed that the current voltage regulator is a reproduction unit with yellow writing on the top.
Searching the internet, I’m finding that the reproduction units with yellow writing are for a car with air conditioning.
And, units for cars without AC have silver writing.
Could this be the issue?
Also, I noticed that my battery is slightly swollen on the “short” sides.
Should I replace it or will it be OK to use once I fix the over charging issue?
I used my battery tester and it said the battery is still good.
Thanks in advance for the assistance.
Like I said, I’m not the best diagnostician.
Your battery voltages look fine, and alternator tests OK. So assuming everything is wired up correctly, the voltage regulator is the most likely problem. The yellow stamped repros are a bit heavier duty, but should work even without air conditioning.
It was mentioned on the Mustang Forum that rather than buying the crappy reproduction units, one should use a current solid state Motorcraft GR540B Voltage Regulator and swap the cover.
Has anyone done this?
Any thoughts?
I’m pissed that I need to replace a brand new battery because of the VR failure, so I don’t want to have to do it again.
Thanks again!!
The reproduction voltage regulators are normally set to charge the battery until it dies. They are junk. AMK sells the regulator top so one can buy a modern electronic voltage regulator and install the top so no one will suspect anything is amiss.
Ugh - do they overcharge? I haven’t had any charging system or battery problems with the silver label repro in a decade now. But I haven’t put many miles on it.
As mentioned before I had the alternator tested and it tested good.
Bought a new 24F AGM Battery.
Bought a new Motorcraft GR540B Voltage Regulator and changed the cover to the repro one off the old VR.
Alternator light stopped flashing/blinking.
So far anyway.
Battery with the engine off: 12.6 V.
Battery with the engine at idle: 14.37 V
So that looks right!
Thanks for the help.
As a side note the innards of the reproduction VR look cheap.
The Motorcraft unit looks much more robust.
I’d probably recommend staying away from the reproduction VRs.
Hello when I had my 68 mustang it did similar things after I replaced the Alt to a higher output I discovered that the Regulator was the problem not before it melted some of the wires .I would check it and maybe replace it with a newer type. my 70 Xr7 doesnt have any more the ALT has it built in
