Repair manual

Troubleshooting the Engine Start System RD 27
wc_tx000948gb.fm 50
Continued from the previous page.
6. Disconnect the wire from the glow plugs (b).
7. With the key switch in the preheat position, measure the voltage between wire
304-BU-8 and ground.
Is 10.0–12.5 VDC measured?
The start aid relay has now been checked. Reconnect the wire to the glow plugs.
Yes ____ No ____
The start aid relay is OK. The start aid relay has failed.
Replace it.