Potential Ground Issue
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Joined: Feb 2023
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From: GA
Potential Ground Issue
Hello all i have a 2006 Electraglide UC
it was wrecked, PO dodge a deer and wound up in the ditch.
Left controls got destroyed fairing got banged up but overall no major damage.
Bike has roughly 60k on it ran fine for about a year after the wreck (occasionally starting it in his garage)
Now i own it have commenced repairs, but i am encountering a issue with the fuel pump relay.
I have the dash off the bike ( no gauges attached) If i bypass the fuel pump relay ie connect a jumper between pins 30 & 87 the fuel pump turns on no problems and the bike starts and runs no issues.
If i install a tested working relay i get nothing, it seems like a bad ground but i cannot seem to determine the ground on this relay
I am utilizing this wiring schematic https://serviceinfo.harley-davidson....ce7b612!!22!54
Any help would be appreciated, ive checked the post ground under the seat forward of the battery and the ground on the starter and the two up by the neck all are tight.
Does th ebike need the gauges installed to start? or am i truthfully having a ground issue?
it was wrecked, PO dodge a deer and wound up in the ditch.
Left controls got destroyed fairing got banged up but overall no major damage.
Bike has roughly 60k on it ran fine for about a year after the wreck (occasionally starting it in his garage)
Now i own it have commenced repairs, but i am encountering a issue with the fuel pump relay.
I have the dash off the bike ( no gauges attached) If i bypass the fuel pump relay ie connect a jumper between pins 30 & 87 the fuel pump turns on no problems and the bike starts and runs no issues.
If i install a tested working relay i get nothing, it seems like a bad ground but i cannot seem to determine the ground on this relay
I am utilizing this wiring schematic https://serviceinfo.harley-davidson....ce7b612!!22!54
Any help would be appreciated, ive checked the post ground under the seat forward of the battery and the ground on the starter and the two up by the neck all are tight.
Does th ebike need the gauges installed to start? or am i truthfully having a ground issue?
Thread Starter
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Novice
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From: GA
i got it with dash gauges removed. I have got it to start without dash/ gauges installed via jumper instead of relay which led me to believe it was a bad relay. I verified that all wires are matched on handlebar controls to factory harness and match HD wiring diagrams from their website. When the relay is plugged in it has 11.99 volts to ground on both sides of the relay pins 85 and 86.even shows 12 volts at pin 87 the relay just will not switch when installed. If i remove the relay and test it t( by applying 12volts across 85 and 86) the relay clicks and operates as it should. resistance check across 85 and 86 is roughly 60 ohms.
Last edited by OtterTail05; Mar 31, 2026 at 05:06 PM.
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@OtterTail05 What I was getting at is what changed from the time the PO had it when it was starting to the time you got it and it wouldnt start? Was it after you replaced the handlebar controls?
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From: GA
@OtterTail05 What I was getting at is what changed from the time the PO had it when it was starting to the time you got it and it wouldn’t start? Was it after you replaced the handlebar controls?
Last edited by OtterTail05; Mar 31, 2026 at 08:03 PM.
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From: GA
Yes but i realized after that i posted it in the wrong forum so i made this post in the correct forum.
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From: Utah
@OtterTail05
I think you are calling the system relay the fuel pump relay. If you turn the ignition on and off/run to run the fuel pump should run for a few seconds. the system relay ground is controlled by the ECM. When you hit the starter the CKP will send a signal to the ECM indicating the engine is rotating and the ECM will ground the system relay coil and the relay will send power to the fuel pump. You dont want the fuel pump running if the engine isn't rotating
.Check the CKP
I think you are calling the system relay the fuel pump relay. If you turn the ignition on and off/run to run the fuel pump should run for a few seconds. the system relay ground is controlled by the ECM. When you hit the starter the CKP will send a signal to the ECM indicating the engine is rotating and the ECM will ground the system relay coil and the relay will send power to the fuel pump. You dont want the fuel pump running if the engine isn't rotating
.Check the CKP
Thread Starter
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Novice
Joined: Feb 2023
Posts: 15
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From: GA
@OtterTail05
I think you are calling the system relay the fuel pump relay. If you turn the ignition on and off/run to run the fuel pump should run for a few seconds. the system relay ground is controlled by the ECM. When you hit the starter the CKP will send a signal to the ECM indicating the engine is rotating and the ECM will ground the system relay coil and the relay will send power to the fuel pump. You dont want the fuel pump running if the engine isn't rotating
.Check the CKP
I think you are calling the system relay the fuel pump relay. If you turn the ignition on and off/run to run the fuel pump should run for a few seconds. the system relay ground is controlled by the ECM. When you hit the starter the CKP will send a signal to the ECM indicating the engine is rotating and the ECM will ground the system relay coil and the relay will send power to the fuel pump. You dont want the fuel pump running if the engine isn't rotating
.Check the CKP