1977 f100 wont start

Asked by Dec 29, 2015 at 09:10 PM about the 1977 Ford F-100

Question type: Maintenance & Repair

replaced cap,rotor,ign module,coil and start solonoid ,battery  truck will turn over but not start  no spark  after trying some troubleshooting i noticed i had no spark when turning key and releasing but if turning key to start and return back to off position ill get a single nice spark so thought it was ign switch  just replaced key cylinder and switch still no start  i am stumped  mind you i am just mechanical but not a mechanic  just pickin your brains  thanks

8 Answers

23,845

AND THE BRAIN BOX IS OK...THOSE THINGS ARE CHEAP NOW AND FAIL ALOT..

20

agree.brain box on fender very common to go bad.and check coil?

1 out of 1 people think this is helpful.

The 1977 is probably a 351 and has a carburetor, That little black box on the fenderwell is the voltage regulator, it does not have a PCM or computer

3 out of 3 people think this is helpful.
20

its silver,and its an ignition box

1 out of 1 people think this is helpful.

Ok, it's your truck but what does an 'ignition box' do'?

2 out of 2 people think this is helpful.
60,225

It is probably the coil rather than a "brain box".

1 out of 1 people think this is helpful.
69,495

The box you all are talking about on the inner fender-wall is the Ignition Control Unit, It has two big plugins on it, silver in color. Guaranteed thats the problem.

1 out of 1 people think this is helpful.
10

get rid of that old dis, go to a one wire coil dis is all togather prom fourm it sove my problem

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