CUCV: How many volts should read at Glow Plug? Relay?

[MuddWeiser]

I am trying to figure out my starting problem.

I am pretty sure it is air but am also curious abou the glow plugs.

I turn on my key and I get the wait light and can hear the relay/solenoid cycling on/off (wait light turns off after the first cycle)...

I checked the voltage of the ORANGE wires (2 heavy duty wires on teh BOTTOM of the solenoid/relay) and I get 23.7volts.

I then checked with a voltmeter, the positive feed touching the GREEN glowplug feed wire, and negetive feed touching battery ground. I get 22-23 volts throughout the different glowplugs.

This seems to make sense to me EXCEPT I thought I read somewhere that the only 24v thing on a CUCV was the starter? Are my glowplugs getting too much voltage?

WHAT COULD BE THE CAUSE?

 

[mangus580]

The glow plugs are a variable voltage, starting up around 22-24, and dropping as the plugs heat up. Its possible, if the plugs are bad, the voltage may never drop... see my other post for help.

 

[Dieselsmoke]

This is part of the problem why the glow plug relays never seem to last. I've always replaced the relays with a 24volt unit and never had another problem with them again on dozens of CUCVs. There was a MWO on this, I had a cases of the relays but only have like 2 left now and keeping those.

 

[CCATLETT1984]

the resistor on the firewallcould have gone bad, the voltage should drop really quickly to 12v if the resistor is working.

 

[mangus580]

I am about 90% sure the voltage will only drop with a load, with mostly bad GP's, it may not have been dropping.... I suggested he bypass the resistors until we could determine better.

 

[MuddWeiser]

CHANGED ALL 8 GlowPlugs with AC Delco 60g's - rewired my glowplug solenoid so its 12v supply comes from front battery lug - now all is well.


CUCV is running good now. Motor is anyway. I got a new problem with the tranny - it winds out to 25-35mph in FIRST GEAR and then 47mph in 2nd gear!


PICTURES ARE AVAILABLE HERE FOR ALL STEELSOLDIER MEMBERS TO SEE!

ftp://steelsoldier:cucv@72.47.20.138

 

[gasser]

I think the trans vacuum unit that is mounted to the left of the IP will most likely needs to be adjusted. With that being said, make sure your vacuum hoses are good ... ones that run from the vacuum modulator on the trans and from the vacuum pump on the backside of the block (on a gas small block, that is where the distributor would be).

Hope this helps,

-graham