From: chance wolf (chance_wolf@shaw.ca)
Date: Thu Jun 17 2004 - 00:05:46 PDT
----- Original Message -----
From: "Mark B. Anderson" <mark@aasurplus.ca>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Wednesday, June 16, 2004 4:25 PM
Subject: [MV] need help with glow plug issue M1009
> Hi All,
>
> ok my glow plugs will not light up.
> the wait light comes on and if I short them across the relay they work yes
I
> put a new relay on.
>
> could this be a fuse issue? if so which fuse as it doesn't say anything in
> any books I have.
> this is on a 1984 M1009 blazer with 6.2 diesel engine
Never seen any 'fuse' in the circuit. If the relay's new and the plugs work
when you short them, it's going to be either the controller card (tucked up
underneath the dash around the fusebox normally) or the temp sensor. If you
pull the card you'll probably see that one of the electrolytic 'can'
capacitors is loosely mounted on the circuit card. Resolder it. Try the
glow plug operation again. I've fixed a couple like that, though I
eventually went to the manual system anyway. :)
The circuit seems fussy as to what sort of relay you use too - likely due to
the primary coil resistance value and the ability of the card to throw it.
There's a document going around detailing all the CUCV glow plug woes which
recommends the NAPA "GPR 109" as a suitable replacement relay which even
bolts up to the same firewall footprint, so if you just procured a generic
replacement which 'looked like it might work', maybe try one of the 109s
instead (once you've ascertained it's not throwing, of course.)
(I don't think there's even a fusible link anywhere in the GP harness
either...)
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