97 hard start suddenly

[royunion]

Oh yes it does.

Spent 11/23/2024 swapping the new starter back in.

Spins the motor but won't start UNLESS the starter charger is hooked up in start mode.

It will start it cold or hot but even though the batteries are fully charged and crank the engine fast, it only starts INSTANTLY with the starter charger hooked up.

You can hear and see the glow plug load on the little generator powering the starter charger.

Even without it I can see the glow plugs hit the batteries before cranking.

No air in the line, as the gauge shows holding 5 to 8 psi when off. Any thoughts what might cause a no inject confition

 

[dbrannon79]

Can you record a video and post it for us to see? my first thought is possibly failing battery cables and or the new starter is not spinning the engine fast enough. you might also want to pull both batteries and go have them tested. have them give you a printout on what each one is providing for cranking amps.

 

[MrMarty51]

Does this still have the side terminal battery cables ?
If so, pull the right side positive cables apart.
Check that lead washer slug between the cables.
Those things become corroded and sort of melt, creating bad connections between the cables.
When that happens, then basically, the starter will be cranking off of just the right side battery.
I used to have to clean those two cable connections and that slug about every six months.
I finally took the entire cable mess to the NAPA store and the sales counter guy and I fabricated up an entire new post terminal cable system.
Now that really works nice.

 

[royunion]

Does this still have the side terminal battery cables ?
If so, pull the right side positive cables apart.
Check that lead washer slug between the cables.
Those things become corroded and sort of melt, creating bad connections between the cables.
When that happens, then basically, the starter will be cranking off of just the right side battery.
I used to have to clean those two cable connections and that slug about every six months.
I finally took the entire cable mess to the NAPA store and the sales counter guy and I fabricated up an entire new post terminal cable system.
Now that really works nice.

@dbrannon79 the new starter spins it plenty fast.

@MrMarty51 no, the batteries are on the side in a case with a door, but since it fires right up on the starter / charger, I must have an amperage problem maybe a ground or the batteries need servicing.

I have a foxwell bt-100 tester, so I will need to out the batteries and test them for charge and reserve and cca

One thing it could be is insufficient amperage to the lift pump which won't overcome the regulator resulting in fuel pressure starvation at crank with a weak CCA.

The batteries have never been run this low before with all the cranking and hot chafging

 

[MrMarty51]

@dbrannon79 the new starter spins it plenty fast.

@MrMarty51 no, the batteries are on the side in a case with a door, but since it fires right up on the starter / charger, I must have an amperage problem maybe a ground or the batteries need servicing.

I have a foxwell bt-100 tester, so I will need to out the batteries and test them for charge and reserve and cca

One thing it could be is insufficient amperage to the lift pump which won't overcome the regulator resulting in fuel pressure starvation at crank with a weak CCA.

The batteries have never been run this low before with all the cranking and hot chafging

I keep forgetting that this is not like my pickup truck.
Pardon Me.