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No power at I-post on solenoid


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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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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: [button=http://www.7173mustangs.com/thread-1973-convertible--3335]My Garage[/button]

 

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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

20180127_082009.jpg

 

 

 

 

 

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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

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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?

 

IMG-20120804-01000.thumb.jpg.c11b259876e3b067d4196b8fb347067f.jpg

IMG-20120804-01001.thumb.jpg.9437eaabeb373d3dd612eb8bfb2b460b.jpg

IMG-20120804-01002.thumb.jpg.960d074f75fe43e49dfa79d9a700916c.jpg

"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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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 :shrug2::shrug2::shrug2::shrug2:power at the coil?

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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

cactus.jpg.92e5d9d8700abc0ed60c8ccb3426248e.jpg

 

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