More starting issues.....HELP!

[deepseeman]

So here it is. I have been driving my truck without problems for quite awhile. All of a sudden I go to start her and I barely get anything. The starter turns over slower than molasses. When I turn on the ignition All lights are bright excep gen #2 and my voltage gage barely moves.
So here are the things I have done;
load tested the batteries-good
replaced starter wires
checked fuses
cleaned battery terminals
tested starter-good
both batteries 12+ volts
26+ volts at starter
checked for any loose wires and found none

I was thinking about replacing the starter relay switch(1559171, but I have power to the solenoid. Isnt that switch all or nothing?
I am at a loss an need to get this fixed by Monday. Any help is appreciated.

 

[CCATLETT1984]

yes that switch is all or nothing.

If you are getting good voltage to the starter, and the solinoid is activating, then i'd start looking to the starter as the suspect. You say that you tested the starter, may I ask how you tested it?

 

[deepseeman]

I took it to a reputable shop and they put it under a load. tested good

 

[CCATLETT1984]

Replace the chassis ground, on front passenger side frame rail.
There is also a Ground cable that should go from the engine to the negative buss bar on the firewall, check it as well.
also check the connection from the postive on the rear battery to the 24v buss on the firewall.

get a buddy and check the voltage at the starter while cranking. it shouldnt drop much.

 

[deepseeman]

Both of the grounds are fine. Im working solo and have nobody to help with the voltage to the starter. Any other suggestions?

 

[CCATLETT1984]

you could make some long leads and be able to see the multi meter from inside the truck. When you crank the truck, do the battery cables get hot?

also another thing to try, pull the glow plugs out and try cranking the truck (without the gp's in it will not have compression)

 

[deepseeman]

Doing that test I only have 5volts to the solenoid. Does this mean my ignition switch is bad?

 

[deepseeman]

also, after my glow plug relay kicks off my gen @ light and volt gage register, but still have barely any juice to the starter.

 

[CCATLETT1984]

could be the relay, worth the $8 to change it.

you have either a poor connection somewhere or a melted wire, its the only thing that could cause poor cranking with a known good starter.

one other thing to try, get a big screwdriver and short the large terminal with the terminal on the solinoid, if it cranks faster then you have an issue with the wiring to the solinoid.

 

[deepseeman]

which relay?

 

[CCATLETT1984]

the large silver one under the dash, its the starter relay.

the only thing that i can think of is that if its only putting 5v to the solinoind then the solinoid might not make good enough connection for the current to flow through the starter.

 

[deepseeman]

now where do you find one for 8 bucks. I priced them at 25 - 40. part#15591718 right?

 

[CCATLETT1984]

go to the local parts store, have them give you an AC40 relay.

 

[deepseeman]

I bought the ac40 relay. I noticed its a 5 prong. Mine is a 4 prong. will it still work?

 

[Armada]

Yes.