1998 Navigator NO low range

[bedrck46]

if you were reading directly at the switch you should get a steady reading at each position if your not then I would suspect that the switch is bad or your meter isn't reading correctly

check rock auto or e-bay for a new switch

What brand and model meter are you using
Have you tested it on a good known source.
Take and touch the two leads of the meter and see what reading you get.

 

[rockinrolla]

it's a brand new fluke meter so it's not that is there away to bypass the switch?

 

[rockinrolla]

also used a scanner didn't have any codes so I pulled up the memory and found a p1812 4wd mode select circuit fail could that be a switch? I think its strange that i have to push the brake for 4 hi and A4WD

 

[bedrck46]

I know you have already done this Just copied the following for your information

Measure the resistance between mode switch terminals 2 and 3 while rotating the mode switch through all positions; refer to the following chart:
Switch Position Resistance Range
2H 3705-4095 ohms
A4WD 1425-1575 ohms
4H 646-714 ohms
4L 228-252 ohms

If you are not getting a steady OHM reading when you test the switch then the switch is most likely bad

Only way to bypass the switch would to get 4 resistors in the required range and install them one at a time to see if the transfer case goes through all the positions

Or try a junk yard or you-pull it yard and take your meter along and find a good switch

 

[bedrck46]

What has me concerned is that your not getting steady OHM readings check all contact points to make sure you are on a clean contact surface or make up jumpers using spade connectors to put on pins 2 and 3 and retest switch also use some contact cleaner and clean all contact surfaces

 

[bedrck46]

When you are driving Can you switch into A4WD and 4hi just by turning the switch

 

[bedrck46]

I would assume that when you normally start the expy that you are in park.

Are you able to start the expy if the gear shift is in Neutral?

 

[stamp11127]

If your test leads came with alligator clips try those on the connectors of the switch. Sounds like you're not getting good contact when trying to read the values.

 

[rockinrolla]

When you are driving Can you switch into A4WD and 4hi just by turning the switch

Only in neutral with the brake applied

 

[rockinrolla]

I would assume that when you normally start the expy that you are in park.

Are you able to start the expy if the gear shift is in Neutral?

Yes i can start in neutral