fuel pump relay - Automotive Wiring and Electrical


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Auto Repair Home>> Automotive Repair>> Automotive Wiring and Electrical

sccole
New User

Sep 20, 2012, 1:32 PM

Post #1 of 4 (1848 views)

fuel pump relay	Sign In

I have a GMC 1500 pickup and I am having problems with the battery going dead after about 12 to 18 hrs if not being used, I have checked all the obvious things and did find the fuel pump relay was put in backwards, could this be the cause of my battery going dead?

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 20, 2012, 1:35 PM

Post #2 of 4 (1844 views)

Re: fuel pump relay	Sign In

No.........

There is a procedure for finding a battery draw like that.

You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 10 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

sccole
New User

Sep 20, 2012, 1:44 PM

Post #3 of 4 (1829 views)

Re: fuel pump relay	Sign In

Thanks, I just read that precedure in a previous post before I posted, I was hoping the relay was my problem, I will will post back when I find it.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 20, 2012, 2:07 PM

Post #4 of 4 (1816 views)

Re: fuel pump relay	Sign In

Those 4 pin GM relays are reversible.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

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