Question about Triumph Tr 7

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Ive lost all connection with my tail lights and my windshield wipers, but i've replaced the fuse and my battery dies when I don't un hook the ground to keep the charge

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Let us start with the draining battery first and with any luck we will hit on a solution with the the lights and wipers. With the battery still disconnected put a ammeter (just a cheap one will do) between the disconnected ground cable and the naked battery terminal and measure the residual current exiting the battery with everything 'off'. remove each fuse in turn, one at a time and record any drop in current before reinserting it. This will identify the circuit responsible for draining the battery. Classic examples are glove box lights staying on when the lid is closed because the contact switch mechanism has been bent out out shape; likewise trunk lights. Once you have identified the offending circuit leave the fuse out and find the relay on that circuit. On many cars individual relays have been combined into a multi-relay module. When you remove the cases for these modules the individual relay assemblies are still all there. A basic relay is usually a cube of about 25mm on a side with four pin connections. Two of the pins are for the low power signal or switch input circuit; turning your wiper switch on only uses a very few milli-amps and light weight wiring. The other two pins are for the heavy power circuit to operate the device requested by the switching circuit: the wiper motor circuit is a heavy power user and is supplied by heavier duty wires. For each relay, fed from circuit from which you have disconnected the fuse, check that the pins are clean and that the socket is also free of dirt, corrosion, water and any signs of obvious shorting. The relay casing will often have printed on the outside a schematic illustrating the pin designations and what they do. Applying 12 volts across the 'switch' pins will result in click as the 'power circuit' pins are connected. Check for continuity across the power circuit pins with the ammeter. If the relay seems faulty remove its cover (sometimes they have transparent covers) and look for obvious burns due to shorting. If everything OK check the wiring of the circuit from the relay to the component (tail lights, wiper motor etc). Disconnect each component in turn to determine device with power drain issues. The devices are usually grounded to the vehicle frame. THis process does not tell you directly what is wrong but gives you the correct approach of finding out. Experience shows that most failures of this type are due to shorting as a result of the effects of water, dirt, oil, and corrosion. Chafing of insulation is a close second.

Posted on Sep 27, 2010

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Looking for the fuse for the wiper motor 2008 chevy impala


WPR fuse 25amp under hood fuse box .
Wiper/Washer System Components
The Wiper/Washer System consists of the following components:
• Windshield wiper/washer switch
• Body control module (BCM)
• Wiper PCB relay
• Wiper high PCB relay
• Windshield wiper motor
• Windshield washer fluid pump
• Windshield washer fluid level switch
• WPR fuse 25 A
• WSW fuse 10 A
This is more then likely not a fuse issue !!!!!!!
Low Speed Operation
When the wiper switch is in the low speed position, ground is applied through the switch internal resistor and the wiper switch low signal circuit to the body control module (BCM). In response to this signal, the BCM energizes the WIPER PCB relay by applying battery voltage through the wiper relay control circuit to the coil side of the relay. This allows battery positive voltage from the WPR fuse to flow through the switch input side of the WIPER PCB relay and out to the switch input side of the WIPER HIGH PCB relay. Since the wiper high relay is de-energized and its switch contacts are normally closed to the low speed control circuit of the windshield wiper motor, the motor will operate at low speed.
Wiper motor low speed operation and the wiper PCB relay can also be commanded ON/OFF by using a scan tool. Refer to Control Module References.
The PCB relays mentioned above are soldered right into the circuit board inside the fuse/relay block under the hood . There are alot of reasons for the wipers not to work ! The fuse could be blown but fuse's don't just blow for no good reason , short to ground , low resistance high current flow etc.... Intermittant !

Power and Grounds
With the ignition in the ON position, accessory voltage is supplied through the 25A WPR fuse to the WIPER PCB relay, the WIPER HIGH PCB relay and the WS WASH PCB relay that are all located in the underhood fuse block. Refer to Wiper/Washer Schematics.
G200 provides ground for the windshield wiper motor and the WIPER PCB relay. G100 provides ground for the windshield washer fluid pump and the windshield washer fluid level switch.

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1 Answer

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