6.7 starter issue, help
Thread Starter
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4wd High
Joined: Mar 2023
Posts: 9
Likes: 5
6.7 starter issue, help
2012 f-250 6.7 , starter was turning over slow, talked to my mechanic friends they said the batterys were probply bad, replaced both batterys , starter still slow , i thought starter was bad, replaced starter, turn key , one click, maybe bad starter, removed new starter had it checked , said it was fine, re installed it , started right up. started 4 times in a row, 5th time wont turn over , just one click. checked fuse and relay , both good, any ideas?
FTE Legend
Joined: Mar 2017
Posts: 31,939
Likes: 9,190
From: Western NY
Any CELs, codes or lights on dash? The first thing that comes to mind is the main harness that cuts across the front of the engine on the front frame cross member in front of the engine. I've read here that there is a small wire that corrodes and causes alternator problems and a battery light to come on the dash. Not sure if this would effect the start of the engine or be a place to start looking.
Fleet Mechanic
Joined: Oct 2022
Posts: 1,822
Likes: 898
From: Dallas Metroplex
Double check all your cables for clean and solid connections (at the batteries, where they terminate). It could be a potential grounding issue, so eliminate that possibility next. If all that checks out it might just be a starter that has some bad windings in it or a flaky solenoid.
Fleet Mechanic
Joined: Oct 2022
Posts: 1,822
Likes: 898
From: Dallas Metroplex
So, you're stating that you have a partially melted starter cable? If so, then yeah, that starter sounds like it's the issue.
Thread Starter
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4wd High
Joined: Mar 2023
Posts: 9
Likes: 5
sorry, i dont have a partialy melted cable, just wondering if a bad starter would draw enough amps to do that or would blow the fuse
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Hotshot
Joined: Oct 2015
Posts: 19,711
Likes: 12,849
From: Wyoming
If the starter was drawing too many amps and the fuse didn't blow then yes, the cable's insulation could melt.
Get a multimeter on the connections/cables at the starter and test for voltage at rest, voltage under load, amperage under load. You'll need a clamp-on multimeter to get the amps.
My guess is that somewhere there is a poor connection.
Get a multimeter on the connections/cables at the starter and test for voltage at rest, voltage under load, amperage under load. You'll need a clamp-on multimeter to get the amps.
My guess is that somewhere there is a poor connection.
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Hotshot
Joined: Oct 2015
Posts: 19,711
Likes: 12,849
From: Wyoming
There was a guy that had a 2017+ truck with batteries that leaked. There was corrosion on the battery cable lug that got into the cable itself and then electrical problems started. The entire cable had to be replaced.
Cargo Master
Joined: Apr 2003
Posts: 2,059
Likes: 426
From: Too close to Houston
Try removing the serpentine belt and see how it cranks then. My son replaced the battery, starter and cables on my ‘00 V-10 when I was out of the country and told me the engine was locked up. I got home to find the a/c clutch bearing had gone out and locked things up via the drive belt.
We’re both better now at diagnosing before replacing parts.
We’re both better now at diagnosing before replacing parts.
Hotshot
Joined: Dec 2005
Posts: 10,253
Likes: 7,684
From: Chino Valley, Arizona
Try removing the serpentine belt and see how it cranks then. My son replaced the battery, starter and cables on my ‘00 V-10 when I was out of the country and told me the engine was locked up. I got home to find the a/c clutch bearing had gone out and locked things up via the drive belt.
We’re both better now at diagnosing before replacing parts.
We’re both better now at diagnosing before replacing parts.
Mountain Pass
Joined: Dec 2011
Posts: 119
Likes: 35
From: Rensselaer NY
A wiring diagram is needed to diag the circuit, should be 12v at that connection.
find the relay that controls that and look for problems supplying current to that connection on starter solenoid.
Start testing & stop with loading the parts cannon, till you can confirm problem.