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No power at I-post on solenoid
#1
Hey guys,

So I tried to start the car for the first time, and she turns over but has no spark. I took a multimeter to the solenoid and I have 12v on the S-post when I crank, but I have no voltage at the I-post. Any idea on what the problem could be?

"BOSS 331"
73 fastback
331ci stroker
wide-ratio toploader
power discs front & rear
9" trak-lok axle w/ 3.70:1 gears
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#2
When you're cranking, the starter solenoid relays 12V to the I terminal. Your starter solenoid is bad.

Let me check your shorts!
http://midlifeharness.com

[Image: Flamicon2.jpg]


[Image: oldfart.png]
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#3
He is correct. When cranking all 4 posts (2 large, 2 small) end up with 12 volts (or close to it, often times during cranking the volts will drop some). Your solinoid is probably bad.

'Mike'
73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

Pics of modifications included in:
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#4
Should be a relatively cheap fix. Solenoid should be available at your local auto parts store. It fits many years of Fords.



Mike AKA Ole Pony & Rare Pony

Our current Mustang garage/driveway
1973 Mustang Convert - Bought in 1974 - Still have it!
2004 Mach 1 Oxford White Auto, Bought Sept 06


[Image: 20180127_082009.jpg]

upload a photo on internet




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#5
Hey guys, so I changed the solenoid today and still able to crank but no power to the I-post. I pulled the harness and checked continuity on the red-blue wire that runs to the I-post and it appears fine, but shouldn't this red-blue wire supply 12v to the I-post and not the other way around?

"BOSS 331"
73 fastback
331ci stroker
wide-ratio toploader
power discs front & rear
9" trak-lok axle w/ 3.70:1 gears
  Reply
#6
The red/blue wire is the trigger for the starter (S post, front post); the brown or red/green wire is for the ignition coil (I post, rear post).

Let me check your shorts!
http://midlifeharness.com

[Image: Flamicon2.jpg]


[Image: oldfart.png]
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#7
I think I found the problem, the fuse box looks like its missing the accessory post and one of its fuse holder brackets. Does anyone have a picture of their fuse box that's in proper condition?

   
   
   

"BOSS 331"
73 fastback
331ci stroker
wide-ratio toploader
power discs front & rear
9" trak-lok axle w/ 3.70:1 gears
  Reply
#8
i just put a new solenoid in my '69 f100 last night and it was bad out of the box! Serves me right for buying from autozone, but i did so cause they are open late....anyways, do you have switch shrug2shrug2shrug2shrug2power at the coil?
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#9
That fuse box configuration is normal; not all Mustangs came with the extra fuse clip for various accessories ordered with the car.

If you need that extra fuse clip, I sell new ones for $20.

Let me check your shorts!
http://midlifeharness.com

[Image: Flamicon2.jpg]


[Image: oldfart.png]
  Reply
#10
Both of my fuse boxes look just like that
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