SOURCE: 1990 Plymouth laser. Where is starter relay
Fuses
There are a number of fuse blocks on these vehicles. The multi-purpose fuse block is located inside the passenger compartment of the vehicle, under the instrument panel, towards the left of the steering column. The dedicated fuses are located in the engine compartment at the left rear corner (if equipped with A/C) and also in front of the right strut tower. Blade type fuses are used.
A blade type fuse has test taps provided to allow checking of the fuse itself, without removing it from the fuse block. A test light can be used. The fuse is okay if the test light comes ON when its one test lead is connected to the test taps (one at a time) and the other lead is grounded. Change the position of the ignition switch so the fuse circuit being tested has voltage applied to it.
Fig. 1: A test light can be used to test the fuse
When a fuse is blown, there are two probable causes as follows: One is that the fuse was blown due to a flow of current exceeding its rating. The other is that it is blown due to a repeated ON/OFF current flowing through it. Which of the two causes is responsible can be easily determined by a visual check as described below:
Fig. 3: State of a fuse blown due to thermal fatigue
Fig. 5: Remove the fuse panel lid by unfastening the clips and pulling it up and off the panel
Fig. 6: Pull the suspect fuse up and out of its receptacle and check the element
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