Batt. tray switch??????

[R.ebel]

On my '97 there appears to some kind of switch in the bottom of the battery tray. The switch is depressed by the weight of the battery. What is it's purpose #ad

 

[illflem]

Rebel, There is a temperature sender under the battery tray that sends a signal to the PCM to vary the rate of charge depending on the battery temp. Things aren't as simple as they used to be.

 

[Missouri Mule]

Yes illflem right. It is the battery temp sensor and if it goes bad ( bad connection, shorted wires... ) Your alternator(generator) will not charge, your EVR(in the computer) needs reading from this and the line voltage to tell the alternator to charge.

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Bill Thomas
Missouri Mule - 96 Wht 4X4 ST CC,5 spd, 3. 54, 8 ft bed, 1 ft high cheater boards.
99 Freightliner bl/wht FL60 ISB-5. 9 24v,215 hp,520 tq,6 spd, 3. 59 nsr,16 ft box, 19. 5 tires,Wt/gvw 11,000/23000