Help needed: 2H diesel cut out--random

[Jan-78FJ40]

Well I've tried about everyone's ideas and still have the problem with random EDIC hic-cups during cruising (never at lower RPM or idle); so far have done the following: replaced dedicated oil pressure switch for EDIC (was R/R the starter for rebuild and replaced sender just because it's so hard to get to--while there, also replaced oil pressure sender and did mod for mechanical oil pressure gauge as well), cleaned and inspected all primary grounds associated with the engine, tightened the wire plug/clip for the oil pressure sender to EDIC for tighter fit, all flat fuses style and haven't noticed anything there--removed all and contacts appeared to be good and fit snug.

The 'hic-cup' does result in the EDIC relay clicking on right side kick panel area where relay is located--checked plugs visually to EDIC relay and at EDIC by opening and did visual then back together.

Haven't done the re-solder as noted above in one input as that would be a lot of work and require wiring harness removal-.

BosBok--you mentioned headlight harness 'mod'; can you explain this more? I've read about it somewhere for 12V systems but have not run across said mod for 24V headlights. I put newer class IV style bulbs and also replaced 3-plug to each headlight with new ones for better connections--I always drive with headlights on and heater is on low speed most times. NOTE: just did the Alt rebuild with double the amps output (50amps) on 24V unit as noted in another article by Stone in BC/Canada--so plenty of output on alt.

ANY suggestions or input would be great--! I've considered replacing the EDIC relay..and will as a next step if no other ideas--it's just that this is so random I can't replicate it (shaking wires when idling, or revs for oil pressure change....or..).

Thanks all!
LCDiesel60
Oregon, USA

I'd replace the relay at this point. I had similar problems with a central american 12V HJ60. Everything checked out fine, but it still had the hickups. Bought a new edic relay (from australia, big money) and it has been fine ever since.
Maybe you can get a loaner relay from someone and see if that cures the problem, before buying one.
cheers,
J

 

[LCDiesel60]

Thanks Jan-good to know that has worked; I actually bought one several months ago as a 'critical spare part' and looks like it will get used sooner than planned.

Thanks!!
MG

 

[BosBok]

BosBok--you mentioned headlight harness 'mod'; can you explain this more? I've read about it somewhere for 12V systems but have not run across said mod for 24V headlights. I put newer class IV style bulbs and also replaced 3-plug to each headlight with new ones for better connections--I always drive with headlights on and heater is on low speed most times. NOTE: just did the Alt rebuild with double the amps output (50amps) on 24V unit as noted in another article by Stone in BC/Canada--so plenty of output on alt.

My HJ60 is 12V all round from factory so my input is 12V related. Basically the headlight mod is to allow the standard wiring loom trigger a relay which opens a circuit that runs from the battery to the headlight (note: you need a relay for dim and a relay for brights).

I'll see if I can find a good writeup on doing this.

As an alternative buy an aftermarket HID conversion kit and fit that...a mate did that on his HJ61 which is 24V all round. Damn the light output puts my HJ60's output to shame!

 

[BosBok]

This is the best writeup I could find at short notice...good luck

Installing Headlamp Relays - Dodge Diesel - Diesel Truck Resource Forums

 

[LCDiesel60]

Thanks BosBok--appreciate the help--it sounds like since I did the high out put light changes already I should be good--they definitely were a good change!
Enjoy the week-
LCDiesel60

 

[Lemon60]

Gosh, mine is EXACTLY the same. And impossible to replicate.
About to go through all wiring/earths. Keeping an eye on this thread for a solution!

 

[samwise]

Not to burst your bubble but that thread is from 2011. There are a lot of good threads on the EDIC problems though. Cleaning grounds, connections, taking the edic motor and relay apart to check for grease on contacts in the motor and corrosion in the relay, testing oil switch or replacing, oil pressure etc etc are all good places to look. Granted Ive done all of those and it still happens, Im going to eventually look at my ignition switch. Keep looking!