• Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech

1965 Mustang flashing lights

  • Thread starter Thread starter Coupejohnny33
  • Start date Start date Aug 19, 2022
C

Coupejohnny33

New Member
Aug 19, 2022
3
0
1
Ontario
Aug 19, 2022
#1
  • Aug 19, 2022
  • #1
Replaced the external regulator. Jumpered 12 v to field on alternator shows 14.7 volts and climbing. Made sure all grounds are good.?.??.?.?.?
 

wicked93gs

15 Year Member
Sep 30, 2006
1,198
228
93
Nashville TN
Aug 23, 2022
#2
  • Aug 23, 2022
  • #2
I think this reading should be mandatory for alternators:

BillaVista.com-Alternator Bible Tech Article by BillaVista


I am not sure what your issue really is here, whether it happened only when your replaced your voltage regulator...or why you replaced your voltage regulator. By "flashing" lights, do you mean flickering? Have you checked voltage at the bulbs? Or only at the battery? This could be something as simple as a bad headlight switch.
 
C

Coupejohnny33

New Member
Aug 19, 2022
3
0
1
Ontario
Aug 24, 2022
#3
  • Aug 24, 2022
  • #3
wicked93gs said:
I think this reading should be mandatory for alternators:

BillaVista.com-Alternator Bible Tech Article by BillaVista


I am not sure what your issue really is here, whether it happened only when your replaced your voltage regulator...or why you replaced your voltage regulator. By "flashing" lights, do you mean flickering? Have you checked voltage at the bulbs? Or only at the battery? This could be something as simple as a bad headlight switch.
Click to expand...
Flickering at the head lights and interior. Battery voltage not changing But changes at interior lights. Ordered a headlight switch. This my first time adding an issue So I entered my post here. Thanks for the reply.
 

wicked93gs

15 Year Member
Sep 30, 2006
1,198
228
93
Nashville TN
Aug 24, 2022
#4
  • Aug 24, 2022
  • #4
No promises on the switch being the problem...but its a good guess if its flickering at both the headlights and the interior since both circuits run through that switch. Aside from that it could really only be grounds but the chances of grounds to both being bad are smaller than a bad headlight switch.
 
C

Coupejohnny33

New Member
Aug 19, 2022
3
0
1
Ontario
Aug 24, 2022
#5
  • Aug 24, 2022
  • #5
wicked93gs said:
No promises on the switch being the problem...but its a good guess if its flickering at both the headlights and the interior since both circuits run through that switch. Aside from that it could really only be grounds but the chances of grounds to both being bad are smaller than a bad headlight switch.
Click to expand...
Thanks.
 
You must log in or register to reply here.

Similar threads

E
2007 GT Stalls when lights or a/c turned on
  • ejscarfo
  • Jun 22, 2026
  • 2005 - 2009 Specific Tech
Replies
2
Views
128
2005 - 2009 Specific Tech Jun 29, 2026
ejscarfo
E
1
1989 gt both doors wont lock or unlock help.
  • 1989 mustang gt
  • Nov 29, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
11
Views
558
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Dec 22, 2025
manicmechanic007
M
12 mustang gt check charging battery light
  • millerj7950$
  • Jan 24, 2026
  • 2005 - 2014 S-197 Mustang -General/Talk-
Replies
1
Views
181
2005 - 2014 S-197 Mustang -General/Talk- May 14, 2026
BossHorseGirl
B
Electrical Issues with my 2006 mustang gt
  • VerneVdV
  • May 22, 2026
  • 2005 - 2009 Specific Tech
Replies
0
Views
84
2005 - 2009 Specific Tech May 22, 2026
VerneVdV
M
Inheriting (and likely restoration of) a 1965 Mustang
  • miniwheats235
  • Feb 17, 2026
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
2
Views
249
1965 - 1973 Classic Mustangs -General/Talk- Feb 19, 2026
Realmongo
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?