I put the Carter fuel pump on today, it fired up and runs good, I did have to put on a regulator as it was running 5psi. Now the weird part. I wired it in to the existing Pump harnes, when I turn on the turn signel you can hear the pump draw down then back and then down with every blink. Do you suppose the new pump requires that much more power to run or what????? Please try and remember that I am an electrical 3rd grader so keep explanations simple with lots of detail:rolleyes: . I'm also thinking that my after market fans maybe doing the same thing, I just ran them to the existing wireing also. Thanks for any and all help. Tim

Tim,

which vehicle? I'm thinking of giving a seminar at the midwest meet on all the things electrical I've learned along the way

 

I'll have a aftermarket pump on, as well as some other goodies

Sounds like you could use a bigger alternator.

 

GD

I'm running a 90 amp XT6 alt on this thing. Sounds like a great idea Mick, I know I can use all the electrical help I can get. Tim

Probably only happens at idle, right? I know that my electrical system pulses with my signals at idle (headlights, voltmeter). Our alternators don't put out much if anything at idle - need a certain rpm to excite, I think. Unless you spend an inordinate amount of time at idle, should be no worries (unless it's happening at higher RPM's, then you've got a problem).

If you don't have a digital voltmeter already Tim you should think about getting one. They are real handy to have around for a lot of things and you can get one for around $30 dollars. Electrons are fun to chase once you understand them a little.

 

With a meter you can check your battery voltage and the alternator output. You may not be getting the full output of the alternator to the battery due to a bad connection and this would cause a voltage drop to the battery. You may just have a loose fanbelt also. Then again, this may just be a normal situation but it sounds to me the battery is a little low on charge.

check your grounds and wiring and make sure that the correct bulbs are installed

my 50 gpm/90psi efi pump, doesnt do that, and i got the stock alternator. prolly a dumb question, but do you have a small battery or something? got a gauge on that thing, to check if pressure is droping?