Bobbed M931 almost done, Pics soon! A few questions please...

[Gunzy]

Here you go for bulb numbers and cross reference for 6, 12 and 24 volt systems.

That is VERY useful. Thanks Mike.

 

[Ford Mechanic]

opcorn:good info here I want to hold on to.

 

[5tonman1971]

Fail safe monitor will fix the lights.

 

[joesco]

That's an understatement Matt!

 

[joesco]

Thanks very much M931A1.

This is just a wild guess since you haven't post what kind of truck your working on , but if it is a 939 series 5 ton your going to need to download this for a wiring diagram to track down the light problems . M939_P2P.zip

 

[joesco]

Thanks expensive part? This truck is becoming a MONEY PIT!!!!

Needs a failsafe module, very common when both lights dont work

 

[MtnSnow]

Easily found for around $149 to $200 depending on which vendor you choose to purchase from

 

[wdbtchr]

Thanks expensive part? This truck is becoming a MONEY PIT!!!!

Trust me, they're all money pits! Sometimes you just have to bite the bullet.

 

[Csm Davis]

Have take out failsafes will be mid next week before I can pull one. What's wrong with the suspension?

 

[MyothersanM1]

What's wrong with the suspension?

^^Yeah^^?? BTW...Don't worry, M809-series trucks are money pits too

 

[joesco]

Thanks PM sent. A friend did my bob and here is thread, lots and lots of issues from the DOT.....

http://www.steelsoldiers.com/showth...almost-done-Pics-soon!-A-few-questions-please

Have take out failsafes will be mid next week before I can pull one. What's wrong with the suspension?

 

[porkysplace]

Thanks PM sent. A friend did my bob and here is thread, lots and lots of issues from the DOT.....

http://www.steelsoldiers.com/showth...almost-done-Pics-soon!-A-few-questions-please

Providing detailed information on the issues from the DOT , would be good information to post to help other avoid the same problems . The link to the build thread can be a great what not to do when bobbing link , but only if you post what's wrong.

 

[joesco]

Will post on both threads..
DOT and five different truck and auto shops observed the following:
<> Spacer blocks to high and hollow, not solid. If "A" block was to be used for a spacer it should have been solid and a bolt from the spring set attached through it.
<> Main leaf spring hangers (2 on each side) on secured with two 1/2 grade 8 bolts, only spot welds on the bottom of the frame
<> Leaf springs only rated for a ton or maybe less
<> No support bracket installed securing u-bolts to the top of the springs
<> Torsion spring improperly installed and only welded to the block sets
<> When the tandem (boggie) axle was removed, the bolts used to secure the axle also served to secure the inner rear frame of the truck. Now there are just holes in the frame. Those bolts were never replaced.

And the list goes on and on and on and on and on!

A lesson on how not to bob a five ton!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Providing detailed information on the issues from the DOT , would be good information to post to help other avoid the same problems . The link to the build thread can be a great what not to do when bobbing link , but only if you post what's wrong.

 

[joesco]

A request was made from another member to post my failed inspection (see thread below) results on this thread also for all to review.....

http://www.steelsoldiers.com/showth...Failed-as-expected-but-two-minor-light-issues

DOT and five different truck and auto shops observed the following:
<> Spacer blocks to high and hollow, not solid. If "A" block was to be used for a spacer it should have been solid and a bolt from the spring set attached through it.
<> Main leaf spring hangers (2 on each side) on secured with two 1/2 grade 8 bolts, only spot welds on the bottom of the frame
<> Leaf springs only rated for a ton or maybe less
<> No support bracket installed securing u-bolts to the top of the springs
<> Torsion spring improperly installed and only welded to the block sets
<> When the tandem (boggie) axle was removed, the bolts used to secure the axle also served to secure the inner rear frame of the truck. Now there are just holes in the frame. Those bolts were never replaced.

And the list goes on and on and on and on and on!

A lesson on how not to bob a five ton!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

[doghead]

I'm going to merge your threads. You are posting duplicate info in them and referencing each of them.

You should have simply continued your original thread.

 

[joesco]

Apologize doghead, thanks!

I'm going to merge your threads. You are posting duplicate info in them and referencing each of them.

You should have simply continued your original thread.

 

[joesco]

I found the Failsafe Monitor Module in the TM, but it doesn't describe it's location. Is it under the dash or hood? Hopefully it's just a bad ground or connection.

 

[wheelspinner]

It is under the hood. The ground is through the mounting spacer. Take them out and make sure it is clean of paint and scale all the way through to the firewall.

 

[twinturb089]

It is under the hood. The ground is through the mounting spacer. Take them out and make sure it is clean of paint and scale all the way through to the firewall.

The failsafe module is NOT under the hood, it is in the left front kick panel in the cab,right above the fresh air vent held on by 2 7/16 bolts,1 ground wire and a large screw on connector with wires coming in the top of it.

 

[joesco]

Thanks twinturbo90 for the correction, sounds like wheelSpinner might have been referring to the PCB. Thanks all!

The failsafe module is NOT under the hood, it is in the left front kick panel in the cab,right above the fresh air vent held on by 2 7/16 bolts,1 ground wire and a large screw on connector with wires coming in the top of it.