84 gmc 2500 g20 6.2

[Bigsmoke]

After cycling the glow plugs Multiple times when cold (48 degrees) the van will not start. If I plug in the block warmer it starts Automatically
I have 12 + volts to the relay at the back of the driverside cylinder head but only 9 1/2 volts out to the glow plugs all 8 glow plugs have power to them but only 9 1/2 volts is that my problem? Any info would be appreciated

[Yukon6.2]

Test your glow plugs to see if they are any good

[DmaxMaverick]

Welcome aboard!

12V in and 9.5V out of a relay is a bad contact. It should carry full voltage. If that's the fact, there's too little juice to heat the plugs enough for a solo start. Easy starting with the block heater almost certainly confirms that.

Your other thread in the Photo Forum, stating essentially the same as this thread, will be deleted.

[Bigsmoke]

I will be checking them. I was told they were just put in not even 2000 miles ago.
But that doesn't mean anything he did use ac delco Ty

[Bigsmoke]

Thank you. I cleaned up some rusted connections and will be checking.
To see if I have more voltage coming out of the relay I actually did not check the voltage. Because I got it running on a cold start with no plug in. Hopefully I fixed the problem. Ty