After replacing my starter my truck voltage surges up & down.Did not do this before replacing starter.I returned starter and got another,installed it and ran fine for about a week and back to surging.

Do have a volt meter ? Watch these videos on voltage drop testing How to voltage drop test starter motor circuit

Starter Voltage Drop

Hi,

If your starter doing nothing after clicking sound, this is telling us the starter is not work. Please check your starter :

1. Voltage input ( it should 12 VDC).If there is power 12 VDC but your engine is not crank/ spin, go check #2 below
2. Check your starter ( its carbon brush==> you may need to clean), starter winding ( check the impedance / resistance ( It should about 0.04 Ohm==> if the value is too far you may use OEM starter and is not the genuine one).

3. If none of above work, kindly return your starter for replacement.


good luck

Dear Sir:

Please read carefully:
Your treadmill, like any other type of sophisticated
electronic equipment, can be seriously damaged by
sudden voltage changes in your homeõs power.
Voltage surges, spikes, and noise interference can
result from weather conditions or from other appliances
being turned on or off. To decrease the possibility of
your treadmill being damaged, always use a surge
suppressor with your treadmill (see drawing 1 at
the right).
To purchase a surge suppressor, see your local
PROFORM dealer or call toll-free 1-800-366-7278
and order part number 14657. Use only a single-outlet
surge suppressor that is UL 1449 listed as a transient
voltage surge suppressor (TVSS). The surge
suppressor must have a UL suppressed voltage rating
of 400 volts or less and a minimum surge dissipation of
450 joules. The surge suppressor must be electrically
rated for 120 volts AC and 15 amps.
This product must be grounded. If it should malfunction
or break down, grounding provides a path of least
resistance for electric current to reduce the risk of electric
shock. This product is equipped with a cord having
an equipment-grounding conductor and a grounding
plug. Plug the power cord into a surge suppressor,
and plug the surge suppressor into an appropriate
outlet that is properly installed and grounded in
accordance with all local codes and ordinances.

If you need Extra help please reach me inmediately.

sincerely. blessing.

E.CUADRA
MANAGUA, NICARAGUA .C.A

How about the voltage from the wall?
You are not using a surge protector are you?
If you are plugged directly into the wall and you did all you say you did,
check the power at the outlet. It might be low.

Let it finish. The unit is recalibrating. It will go all the way up, pause, then all the way down, then pause, then double beep. The console will return to normal. The unit was knock out of calibration by a voltage surge and the reason all treadmills should be on a surge protector when in use and unplugged when not in use

What I would check first is the starter, when it don't wont to start, with a test light check voltage down at starter, the small wire on the starter come's from the ignition switch, while some one holds the key to start check voltage at small wire, there should be voltage there as long as key is held on start, on the big wire at starter it should always have voltage with key on or off, if you do have voltage replace starter intermitly going out, now if you don't have voltage at small wire, check or replace neutral safety switch.

down by the start is a fused link, this link may have burned out and will need replaced before you will get voltage to the starter

HI. there are several problem areas that will need to be inspected. follow the list below to address this issue further.

CHECK LIST:

1. Fuel Filter. If the filter has not been change recently, this will be the culprit. Clogs in the filter will cause surging. replace if needed

2. Intake Manifold Gasket. Check this gasket for leaks, or worn edges. replace if damage is visible.

3. Fresh Air Intake Hose. This hose may be clogged, or damaged. inspect for these faults. replace if needed.

4. Fuel Pump. A weak, or poorly grounded pump will cause low fuel pressure, in return, causing the surge effect. inspect the fuel pump for these faults. replace if needed.

5. Fuel Injectors. A dirty, or faulty injector will cause the surge as well. inspect the injectors for faults. replace any injector that is faulty.

6. Oxygen sensor(s). A faulty O2 sensor will promote surging as well. This will usually be accompanied by an illuminated check engine light. If this is the case. the O2 sensors should be changed.

7. Carburetor. A Dirty and Improperly Functioning Carburetor will cause the surge effect, also. Check to make sure the carb is functioning correctly(IF EQUIPPED)

8. Map Sensor . A defective manifold absolute pressure sensor may cause a rich or lean air/fuel ratio, excessive fuel consumption, and engine surging. this diagnosis applies to map sensors that produce an analog voltage signal. To check the sensor, back-probe the 5-volt reference wire(with the ignition on), and connect a voltmeter from the reference wire to ground. If the reference wire is not supplying the specified voltage, check the voltage on this wire at the computer. If the voltage is within specifications at the computer, but low at the sensor, repair the reference wire. When this voltage is low at the computer, check the voltage supply wires and ground wires on the computer. If these wires are satisfactory, replace the computer.

With the ignition switch on, connect the voltmeter from the sensor ground wire to the battery ground. If the voltage drop across this circuit exceeds specifications, repair the ground wire from the sensor to the computer.


This concludes the surge inspection chart. you will find the issue in one, or more of the areas stated above.

It looks like the starter that you installed needs a set of starter solenoid contacts replaced. The clicking noise is the solenoid energizing, and being drawn down, but the second contact is not getting the battery voltage, to transmit the power to the windings.

right off hand, i would do an amp draw test on the starter. if the starter draws too many amps, the voltage will pull down and some modules will not produce spark until you release the button. the voltage will surge upward allowing the module to fire. points will fire but will be extremely weak.