Join Date: Jun 2004
Location: Yakima, washington
More head light troubles.
OK here goes.
Recently the headlight failure lamp came on. My low beam is weak, but the high beam seem OK. I replaced the bulb, but the problem is the same. I replaced the Reserve Lighting Unit and the Junction Box, but that did not fix the problem.
Looking at the attachment maybe one of you can help me here.The headlight warning lamp comes on when there is battery on the LG/R wire (#1). The LG/R lead comes from the RLU, but as I said I changed that out, so that isn't the cause.
By progress of elimination I have determined that the BL lead (#2) is causing the LR/R lead to have battery on it.
This lead connects to the Junction Box which I have changed out. So, sometning beyond the Junction Box is causing the trouble.
It looks like that when the Headlight Relay is operated there is 12 volts on the BL lead via the 10 amp fuse which is fed with the BR/W lead #4 which in turn goes to the ignition switch.
I must be reading the diagram wrong, or am I missing something?
I am assuming that the 12 volts on lead #2 is a normal condition, so if there were vo voltage on this lead it might cause a voltage output on lead #1 which would acuse the headlight failure lamp to come on.