Question about 1998 Chevrolet C3500

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No power to a/c relay - 1998 Chevrolet C3500

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Check green wire for a break or a short

Posted on Aug 09, 2008


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Relay seems to be getting power ( it's clicking) there is NO FUSE OR FUSABLE LINK. Wire straight from relay has no power. Add power to it and still get none from the other end.

A couple of things: Relays have a power side, and a coil side which signals the relay on. Your coil side is working, hence the click, which should close contacts on the power side, and send power out from the relay.

Just possible your relay is bad on the power side. Swap it with another relay to check. The exact same relay may have other applications on your car. If the relay's part numbers match, it is the same relay.

The other possibility is the power feed for the relay may have been lost. Usually the power side, the power feed terminal, is hot at all times- battery voltage available at the relay-just waiting to be sent to do work. And if it is "hot at all times", that means the power feed is fed from a maxifuse or a fusible link. Power from the battery would not be sent there without a fuse or fuse link for protection.

If you have a test light or voltmeter, try this: pull the relay out, key off, and probe all 4 or 5 terminals of the relay plug terminals. If "hot at all times", one terminal should show power on it. If it is a hot at all times terminal, your relay is definitely bad if you find power there. Now some circuits with a relay, like some starter relays, do not have a hot at all times power feed- only when key is on, or when relay is signaled, does the power feed show up. To check this, turn the key to on, or to start if a starter relay, and now check all relay terminals with the test light. This time you should show two hot terminals- the power side feed and the coil side (the relay signal side) should both have power on them. If you only see the coil side power that made the click, then you have to check the wiring to that relay. Good luck.

Jun 16, 2015 | Cars & Trucks

1 Answer

No power to ems relay,ignition amplifier,or ignition coil . fully charged battery with 12.66 volts coming out of ignition on relay

Check the power at the relay at right front fuse box if no power check back wire as it runs to the relays beside the radiator.

Mar 24, 2014 | 1994 Jaguar XJ6

1 Answer

I'm not getting power to the fuel pump,it is a 2002 blazer 2 door, the only way I get any power to it is if I manually touch the points together in the fuel relay switch other wise nothing, do you ha ve...

If by manually touching the relay points give you power to the fuel pump , i would assume that your relay is bad on the power side.

try to exchange the relay with one other of your fuse box . If it works fine with other relay change the relay and you'll be on your way.

Just for you to know!!!

Here is how a relay works you have a driving side and a power side . the driving side is in fact an electrically operated switch that when current is apply closes the switch that is on the power side.

Test your relay by asking somebody to put one finger on the fuel pump relay. when you have power on and of on the driving side of the relay, the other person will sence that the relay is clicking . if it desn't change the relay cause it's burnt on the driving side. if it does and you don't have power to your fuel pump chnage the relay cause it's burnt on the power side.

Jan 26, 2014 | 2002 Chevrolet Blazer

1 Answer

How can you tell if relays in fuse panel are good

They can be tested if pulled out. Know how a relay works? Relays have a power side and a coil side. When the coil side is energized from voltage applied to it, the electrical contacts on the power side close allowing power to pass through the relay from the power feed supply on to the part the relay controls.

To test one, you use jumper wires from the battery to the coil side. Usually will hear a click-showing the power side contacts did close. The relay will have a small diagram etched into it, showing which two or more terminals are for the coil side, and which other terminals are the power side. If more than four terminals, the diagram will show how all are tied into the relay. Jumper a positive wire to the coil side input terminal, and a negative to the coil output terminal. If you have a multi meter, check that the power side terminals show continuity when coil side is jumped. It should have continuity-relay is good. If no multi meter, but you can hear or feel a click when testing-probably good.
That's the only way to test relays. Another solution if you suspect a bad relay is to swap in a known good relay. When the relay is pulled out, a good idea to check if the power feed for the relay is present. Use a test light grounded to a screw or metal bracket, and probe all the terminals that relay plugs in to. One terminal should have power lighting the test light, verifying power feed is good. Most, if not all relays, have a power source that is hot at all times, but if you find no power on any terminal, turn the key to on and check again-that relay may only have power available when key is in on or run.
Good luck.

Sep 24, 2013 | 2000 Buick LeSabre

1 Answer

I have a 1996 mustang v6 no power to fuel pump. Bought used fuel pump relay still have np power. Safty switch is good. Unpluged fuel turned switch on and i have constant power of 9.52 volts plug in pump...

9.5 volts sounds like the power coming from the gas gauge.
I am showing a relay module with the fuel pump and pcm relays built in along with two other relays. The fuel pump relay should not be accessable. In most cases the pump relay gets power from a 20amp fuse and the computer grounds the relay when needed. Power goes from the pump relay to the inertia switch then to the pump. So the inertia switch should be hot when the pump relay is activated.

Jun 12, 2013 | Cars & Trucks

1 Answer

I have a 1994 caravelle with 4.3 v6. The fuel pump does not run when starting or after it starts. It will run if you jump it off of battery. I've checked wires and anything I can think of but still no...

Try a different relay for the fuel pump relay. Manufacturers often use the same part number relay for different circuits, different uses. If a different relay doesn't work, use a test light and check for power at the relay. One terminal where relay plugs in should have power at all times-this is the power that relay will pass to the pump when relay is energized. If no power, check, it may only have power available when key is on. When key is held in crank, two relay terminals should have power, the main feed and the signal from computer that turns relay on to pass power.

Jun 04, 2013 | Cars & Trucks

2 Answers

I have a 92 sentra lights come on but when i turn key nothing happens. Starter good ,relay good, head lights don't dim when you turn key . Car won't turn over at all

If by lights, you mean the dash lights come on, then ignition switch must be getting power. If dash is not working with key on, check the 30 amp fuse link which powers the ignition switch.
If switch is good and starter is good, the start wire from switch goes to, if automatic, to inhibitor relay (the park/neutral function) and then to starter. There is also an inhibitor switch on the shifter or on the transaxle that turns on the inhibitor relay when key is on and shifter in park or neutral. The inhibitor switch is powered by a 10 amp fuse D.
If you have a manual transmission, the start wire from ignition switch goes to the clutch interlock relay and then to the starter. This relay is turned on by the clutch interlock switch on the clutch pedal.
You can check for power on either relay, the inhibitor relay or the clutch interlock relay, with a test light. Pull the relay out, have the key held in start position. Now both relays would have power showing on two terminals where the relay plugs in. If inhibitor relay only has power on one terminal or no power at all, either ignition switch is not sending power or fuse D is out or the inhibitor switch is not working right. If clutch interlock switch does not have power on two terminals either the ignition switch is not sending power or the clutch interlock switch is bad.
If the relay checks are good, check for power on the small wire to starter with key held in start. If you have power there, the starter solenoid must be out.

May 08, 2013 | Cars & Trucks

1 Answer

What on the land rover 3.9 (1996) does the 60amp circuit operate, on mine the fused area wiring etc has burnt out. Wether there is a connection, but I now have no heated sceen, no interior lidht and no...

RL1 Front Wiper Control Relay RL2 ABS Power Relay RL3 Air Suspension Power Relay RL4 Right Heated Front Screen Relay RL5 Left Heated Front Screen Relay RL6 Auxiliary Power 1 Relay RL7 Auxiliary Power 2 Relay RL8 Front Wiper Interval Relay RL9 Horn Relay RL10 Spare Relay RL11 Headlamps Wash/Wipe Relay RL12 Fuel Pump Relay RL13 A/C Condenser Fan 1 Relay RL14 A/C Condenser Fan 2 Relay RL15 Ignition Relay RL16 Starter Relay RL17 ABS Pump Relay RL18 A/C Control Relay RL19 Engine Main Control Relay RL20 Air Suspension Compressor Relay

Aug 23, 2011 | Land Rover Discovery Cars & Trucks

1 Answer

2000 ford explorer, fuse box don't show me what fuses are for

There are two fuse boxes. A baqttery junction box under the hood on the drivers side and one inside on drivers side. Good luck.



Fuse Amp


Power Distribution Box


1 60A** I/P Fuse Panel

2 40A** Blower Motor Relay

3 50A** 4 Wheel Anti-Lock Brake System

(4WABS) Module

4 30A** Power Windows, Power Moon

Roof, Power Seat

5 50A** Ignition Switch, Starter Relay

6 20A** Transfer Case Relay

7 - Not Used

8 20A** Air Suspension

9 40A** Air Suspension

10 30A** PCM Power Relay

1 10A* A/C Relay

2 30A* Heated Seats

3 30A* Heated Backlight

4 15A* Fog Lamps and Daytime Running


5 4 3 2 1

10 9 8 7 6

12 11 10 9

8 7 6 5

4 3 2 1

15 14 13

2 1 1









3 2



Roadside emergencies




Fuse Amp


Power Distribution Box


5 - Not Used

6 10A* Powertrain Control Module

7 30A* 4 Wheel Anti-Lock System

(4WABS) Module

8 15A* Rear Wiper Motor

9 20A* Fuel Pump Relay and RAP


10 15A* Horn Relay

11 15A* Parklamps Relay and Mainlight


12 30A* Mainlight Switch and

Multifunction Switch

13 15A* Heated Oxygen Sensor, EGR

Vacuum Regulator, EVR Solenoid,

Camshaft Position (CMP) Sensor,

Canister Vent Solenoid

14 30A* Generator/Voltage Regulator

15 - Not Used

1 - Wiper Park Relay

2 - A/C Relay

3 - Wiper High/Low Relay

4 - PCM Power Relay

5 - Fuel Pump Relay

6 - Starter Relay

7 - Horn Relay

8 - Rear Wipe Down Relay

9 - Blower Motor Relay

10 - Rear Wipe Up Relay

1 - Not Used

1 - DRL Diode
2 - Electronic Engine Controls Diode

Apr 06, 2011 | 2000 Ford Explorer

1 Answer

Sunroof will not work

Power is supplied to the Power windows and sunroof through the power window circuit breaker. That circuit breaker is supplied power through the RAP (retained accessory power) Relay, the RAP relay also supplies power to the radio. The RAP relay is also fuse protected by the RAP fuse in the under hood fuse block. The RAP relay is energized by the BCM body control module.

The RAP relay is responsible for the radio and windows working after the igntion is turned off.

The first place to check would be the RAP fuse in the under hood fuse block and then the RAP relay in the Body fuse block.

A list of the BODY relay block located on the left side of the dash to the right of the interior fuse block is below:

(1) Park Lamp Relay (2) Courtesy Lamp Relay (3) Retained Accessory Power (RAP) Relay (4) Power Seats Circuit Breaker (5) Power Windows Circuit Breaker (6) Inadvertent Power Relay (7) Door Lock Relay (8) Headlamp Ground Relay (9) Driver Door Unlock Relay (10) Door Unlock Relay(1) Park Lamp Relay
(2) Courtesy Lamp Relay
(3) Retained Accessory Power (RAP) Relay
(4) Power Seats Circuit Breaker
(5) Power Windows Circuit Breaker
(6) Inadvertent Power Relay
(7) Door Lock Relay
(8) Headlamp Ground Relay
(9) Driver Door Unlock Relay
(10) Door Unlock Relay
(1) Park Lamp Relay (2) Courtesy Lamp Relay (3) Retained Accessory Power (RAP) Relay (4) Power Seats Circuit Breaker (5) Power Windows Circuit Breaker (6) Inadvertent Power Relay (7) Door Lock Relay (8) Headlamp Ground Relay (9) Driver Door Unlock Relay (10) Door Unlock Relay (1) Park Lamp Relay (2) Courtesy Lamp Relay (3) Retained Accessory Power (RAP) Relay (4) Power Seats Circuit Breaker (5) Power Windows Circuit Breaker (6) Inadvertent Power Relay (7) Door Lock Relay (8) Headlamp Ground Relay (9) Driver Door Unlock Relay (10) Door Unlock Relay

I’m happy to help further over the phone at

Jul 10, 2010 | 2000 Chevrolet Blazer

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