How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Matt Your Own Question
Matt, Engineer
Category: Ford
Satisfied Customers: 21858
Experience:  BEng hons Mech engineering, in auto industry 22 years
Type Your Ford Question Here...
Matt is online now
A new question is answered every 9 seconds

I've replaced the alt and battery and the lights surge dim

Customer Question

I've replaced the alt and battery and the lights surge dim to brite and within 3miles of starting the voltage light comes on in the dash
Submitted: 1 year ago.
Category: Ford
Expert:  Matt replied 1 year ago.


next check that the main battery connections are tight and in good condition also check the earth strap to the engine / gearbox for cleanliness and tightness

there are also a couple of small earth wires that run out of the engine bay wiring loom and are secured to the engine with a ring terminal and a small bolt - these earth the ECU

double check that where the alternator bolts to the engine - this too has no corrosion and its bolts are tight

if this is all OK then I'd next check the high power fuses in the engine bay fusebox for corroded contacts and cracks