The voltage is kind of a misnomer. They are being driven off 12V, with a voltage drop due to the wiring and load sense resistor(the squiggly piece of metal on the controller).

7.3 GPs(round terminal) are lower voltage(lower resistance, to be more precise) than the 6.9 GPs(spade terminal). However, you can't connect /either/ of them to 12V for very long(~10-15s at a time) without burning them out.

If your controller is the round one which screws into the back of the motor, it should be used with the spade glow plugs. If it's the black box with visible relay mounted to it, it should be used with round-style glow plugs.

At least, that's as far as I know.

 

That's where you had me confused... The 6.9 also had the round terminal and squiggly piece of metal and controller mounted behind the intake, for the year 87. Which is what I have. Which means it also is 6 volts at the GP. Thanks

 

Awesome! I just found one on fleabay for less than $30. 2004-2010 Ford 6.0L Diesel Glow Plug Harness Right & Left E350 E450 F250 F350 | eBay

 

Looks like they sold out of the set I just purchased for $19.95


http://www.ebay.com/itm/301536086505?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

 

Keep an eye on this guy. I bought the 2nd to last one a month or so ago,
then he resupplied his inventory and just ran out again.


Charlie

 

good catch!

 

This guy is back up with 10 available for $19.95, with tool and free shipping.
Best price on E-Bay, think I`ll order another set for a spare.


http://www.ebay.com/itm/301536086505?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT&rmvSB=true

Charlie

 

Figures! I just paid $8 more last week because he was sold out! Oh well, I didn't want to wait for it anyway. Should be here tomorrow!

 

wish they came with the flat terminals so i wouldnt have to change glowpulgs

 

Just remember that the two types of glow plugs are /different/, and will /not/ work with the other controller.

If you have spade terminal glow plugs, just make a harness - the connectors are just 3/8 spade females and are relatively easy to come by.

 

controllers are for suckers, i run push buttons.

 

In that case, you *also* want to be concerned - the spade terminal GPs have a higher resistance(slower glow); the round type are designed to be run behind a loading resistor and are far more finicky when it comes to on-time.

I mean, by all means... do it. Just don't be surprised when you fry a set of the round-type.

My own best push button setup(which has served me well for the last 3+ years) uses:
1. spade-type glow plugs
2. loading resistor from the 7.3/round-type setup(the bent strip of steel that sits on the controller and zig-zags it's way downward)
3. 9th glow plug wires in to the relay and mounted in the cab.

It's been a good 2 years since I've fried a single glow plug doing this - the higher resistance spade-type glow plugs plus the added loading resistor makes it take a bit longer for a good glow - usually about 15 seconds. The 9th glow plug in the cab gives me instant feedback as to how warm they are getting.

 

I ordered another GP harness on the second and got it today. Can`t hurt to have a spare.
I see he raised his price from $19.95 to $24.95
But did find a good price here. $19.53


http://www.ebay.com/itm/Diesel-Glow-Plug-Harness-Right-Left-04-10-Ford-6-0L/291841050502?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D2%26asc%3D38530%26meid%3De088628c532d4a45a573354556f840e2%26pid%3D100005%26rk%3D1%26rkt%3D6%26sd%3D301536086505

Charlie

 

Any updates on this overall? Is everyone still happy with this harness and not seeing any major issues? I'm chasing what appears to be a short in mine and I'm considering this as a full replacement. Just wondering peoples' experiences after a bit of time as this thread has been lingering for a while now.

Thanks.

 

I haven't run mine a whole lot but I was glad I used it. I noticed it sits better on the driver side if you remove the black T shaped clip that goes over the loom. A little wire is exposed but there's no tension on the wires.

I had an issue at first with the harness slipping off but I removed the dielectric grease I had added and it hasn't been a problem since.

Definitely worth the $40 I paid!