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Those things were removed from service....problems with staying on and de-laming windows.

look real type. Check with Ohm meter...1.0 to about 3.0 are good. If no reading or all 0000....then bad. If they read good, then start box or TSU are bad.

54B is on the eng. side connector pin A at start box. 54B goes through start box....and out through pin B wire 29c of body harness to start switch wire 29 A.

Ohm check glo plugs...1.0 to about 3 ohms...anything different like 0000 or no reading...then there toast. If toast then your box fried them . If you have a PCB box....those are real old and have been updated to EESS, and then to S3 smart start. The last two use a TSU controller in water...

I had an A/C pump frozen ..belt was still on...I rotated motor with a big wrench turning the Alternator. A/C pump no rotate, but everything else did by hand after removing belt tension.

I have the Q.D. end for your hose.....there are two types...they will not interchange.

If you have a silver label black KDS....they are not a good unit...and they only work with a GPC 12338772

11 a/b constant volt 15A constant volt 54A from inj pump to 54B on start box eng conn. 29C from start sw. to Start box body conn.

Glow plugs roasted on an open fire.....Jack frost won't let it start......

If the truck has the 4 spd. trans..... The relay in the panel behind batteries do fail on with ign. switch off. If trans light works, and if relay fails on....light will be on with ign. switch off.

The relay in the panel behind batteries do fail on with ign. switch off. If trans light works, and if relay fails on....light will be on with ign. switch off.

I have the test box Camo made. I can test boxes.

Hummer H1 mech's ....look for them also.

Do you have a 3 spd. truck...what model on data plate ? I have a few rebuilt pumps.

Front is offset from factory

74a power goes through the nuetral safety sw., the to start box....then to starter

I have lots of NOS loops...the large ones for that....I'll get a number...but mine are available.

Need to see what eng. you have...an early or late serp belt system. The nut for that pully is a double system for the late serp system with the black round reservoir above left valve cover. The early serp system has the hidden power steering pump and alternator takes a different pully.

Get a camoteksystens.com box and be done with problems... and put new glow plugs, or at least good ones.