I have an 87 300TD wagon that won't start and is indicating the preglow cycle is not operating properly. I have switched out the glowplugs, changed the 80 amp fuse in the control unit and tested the glow plug wiring. All is okay but it still won't start and the preglow light won't come on.

My question: the troubleshooting guide says to check for 1) interruption of power to terminal 30 in the glow controller; or 2) change out preglow timer power relay.

Where is terminal 30 and the preglow timer powert relay??

I realize the questions may be basic, but I would REALLY appreciate any help.

- Rob

 

I'd greatly appreciate any insight. I'm new to this car and hope to learn as I go.

- Thanks, Rob

 

Terminal 30 runs from the transmission selector (neutral safety switch ) back into the engine compartment. It receives power from terminal 52? in the safety switch if memory serves me. No power to 30 usually means theswitch is failed. You need to look on theelectrical schematic and see if Ihave this right. I've jumpered the switch harness to get people out of a jam and to verify the switch was causing the problem but replaced theswitch at the first opportunity.