No power to fuel pump (what to diagnose?)

[eg mike]

I installed a full main harness in my car Saturday and after done, no power to the fuel pump.

I tried 3 different main relays and still no luck.
I checked Fuse 18 and its good.


Anyone know what I should check for next?

[Barefoot]

do u have power going into the main relay

[eg mike]

do u have power going into the main relay

Yes I got a constant hot on the white wire I believe with test light.

[Tech5]

so your test light works?

Are you trying KNOWN working Main Relays???


Is your ignition switch working ? not the lock cylinder the electrical part?

all your plugs firmly installed correctly and was this a used or new harness? if used did you check for cut wires,burnt,cracked,wires?

Have you tried hitting your dash with your fist lol

[Barefoot]

Yes I got a constant hot on the white wire I believe with test light.there has to be a fault in the new harness someplace. if u have power going out but nothing at the other end.

[B18c1Turboed]

Put the pump on a seperate relay then ,use a 12v soure and toggle to trigger the main relay on.

[PURP]

Damn, Mike. I'm having the same problem... shit's gay

[ash7]

Check your thermostat ground - according to the schematic, that's where the relay gets its ground.

-jonathan

[Z0_o6]

Check your thermostat ground - according to the schematic, that's where the relay gets its ground.

-jonathan

bingo. 90% of the time after swapping a harness, people miss a small ground somewhere.

[preferredduck]

bingo. 90% of the time after swapping a harness, people miss a small ground somewhere.

these are there for a reason' i hate electrical troubleshooting but the first thing i check is it grounded.

[Motivation]

he figured out the problem... Was the relay... The three he tested were all bad.

[ash7]

he figured out the problem... Was the relay... The three he tested were all bad.
Lol - sad... Almost typical of a Honda relay. :goodjob:

-Jonathan

[eg mike]

he figured out the problem... Was the relay... The three he tested were all bad.


Yeah, I tested them on Sunday when it was like 85 degrees outside..... I re-tested last night after going through the schematic and was about to give up and tried the main relays again. Got 1 to work!

I should of known the heat would of got to the relays! The solder on them crack from heat and its screws the connection up!

Well coupe is running smooth, and I am excited to finish putting it back together!

Thanks for all the comments guys!



Purp try some other main relays :P