50 amp diesel start fuse burnt

[DavidC]

Bill, just checking as there is a lot of starter talk going on. I would not think there is a big difference between 98 and 99. The 99 shows a 30 amp feeding the starter.

The 50 amp I find

Just checking to see if you are going in the right direction or I am looking in the wrong direction.

 

[BillBaker]

DavidC... well I found some info on this. Here's what i find. I will have to dig in over the next few days.

 

[DavidC]

Possible to unplug the shutdown solenoid and install an in line fuse of smaller amperage ?. I can't imagine a solenoid needing 50 amps. I know a sticking solenoid can amp off the charts and take out that fuse.

 

[BillBaker]

I'm starting to question the FSS, think I'll pull it off and see if it needs a cleaning. Doesn't have a dust boot and hasn't for as long as I've had the truck (9 years). Anyone recommend if any grease should be used on the shaft and what kind?...

 

[DavidC]

I do not know for sure about the FSS but in the mining industry we never used grease but disassembled and cleaned the operating mechanism for free movement. Grease tends to attract dirt.

 

[BillBaker]

I do not know for sure about the FSS but in the mining industry we never used grease but disassembled and cleaned the operating mechanism for free movement. Grease tends to attract dirt.

I see 50/50 on it but lean towards not using any for the reason you said... I'd bet it's a gunk collector.

 

[DavidC]

Others may know better but I would clean thoroughly for free movement assemble and get a dust boot. I would also look into an in line lighter fuse if possible maybe a 30.

 

[BigPapa]

The boot is not necessary. Mine hasn’t had one on it for well over 10 years and probably 300K+ miles. Take it apart and clean it. Put it back together dry.

David, the ‘99 is totally different than his ‘98 12 valve, and yes, to pull that solenoid up takes a lot of amps. It has a 50amp fuse and is powered by a 60 or 90amp relay. I can’t remember which. The hold up side of the solenoid runs through a 10amp fuse.

This is the circuit.