g/p relay
Thread Starter
|
Senior User
Joined: Feb 2013
Posts: 183
Likes: 2
g/p relay
i got some info here the other day, wanted to put some #s out there, both batteries 12.57 and clean. relay big term. is same with key off 12.57,always hot. turn key on wts for g/p,s -the always hot one is 11.50 and other big one is 11.24 -both little ones have .02 with key off. checked all connections i could get to. unplugged wire going into v/c just checked 1 had 11.24[1 going to g/p] any sug. preciated
Thread Starter
|
Senior User
Joined: Feb 2013
Posts: 183
Likes: 2
g/p relay
my 96pws used to not start under 50 deg. [had to plug itin] found some battery issues now it starts at 30 or so but i have to cycle threw g/p system 3-4 times then crank it.--new g/p relay ,g/p`s,fuelheater-getting juice to g/ps,11.24v.-relay clicks and seems to funtion properly-all fuses good.harness maybe 2yrs ole[$1,000]
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
my 96pws used to not start under 50 deg. [had to plug itin] found some battery issues now it starts at 30 or so but i have to cycle threw g/p system 3-4 times then crank it.--new g/p relay ,g/p`s,fuelheater-getting juice to g/ps,11.24v.-relay clicks and seems to funtion properly-all fuses good.harness maybe 2yrs ole[$1,000]
The 11.50 -> 11.24 drop is 0.26V, which is within the limit (0.3V) of what's considered a "good" relay. Next thing to measure is the glow plugs themselves. Check resistance at the valve cover connectors. I've heard lots of ranges, but between 0.5 and 2.0 ohms should mean that the plugs are good.
Once it starts, are you getting any/much white smoke?
Hotshot
Joined: Jan 2012
Posts: 11,132
Likes: 3
From: Southern West Virginia
Like madpogue said, the glow plugs stay on a lot longer than the WTS light. I turn the key on and wait up to a minute sometimes. If you want to see how long they actually stay on, watch your voltage gauge in the dash. When you turn the key on, the needle will be down around the "N" in NORMAL. Don't try to start the truck, just watch the gauge. When you see it jump up to about the "R", the glow plugs just went off. Time it and see how long they stay on, and you can base your wait to start time on that.
Trending Topics
Post Fiend
Joined: Dec 2009
Posts: 15,505
Likes: 18
From: Livoina,La
Am I the only one that caught that he has voltage to both little wires?
Am i missing something? Only one should have voltage. The other is a commanded ground by the PCM
Am i missing something? Only one should have voltage. The other is a commanded ground by the PCM
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Thread Starter
|
Senior User
Joined: Feb 2013
Posts: 183
Likes: 2
g/p relay
will check that now,also when truck does start hot or cold ,alt gauge reads really low for 2 or so min., then boom rises up to normal. cleaned dr.side neg. on block ,pretty nasty,- do passside today,hard to get to-THANX!
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
Perfectly normal on a cold truck; that's the glow plugs timing out (see owner's manual). That period should be shorter, 30 seconds or so, on a warmed-up truck. It's based on EOT - engine oil temp - reported to the PCM. If you can get access to a scanner / gauge that reads live data, check the EOT value when the truck is warmed up; that sensor may not be accurately reading the oil temp.
Thread Starter
|
Senior User
Joined: Feb 2013
Posts: 183
Likes: 2
g/prelay
just came in-43degs out-wts light was on 31 secs.-alt gauge was below the N in normal, just a hair-1min,33secs. alt gauge went up to the right side of the N-did it 2xs did not start, in the past if i do it 3-4xs it`ll probely start-it chugged a little but didnt start
