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Old 09-04-2017, 09:38 PM
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bkvail bkvail is offline
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Location: Hamilton, Washington
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Default new wiring harness - what needs a relay?

we are installing a new wiring harness (21 circuit harness from speedway) and instructions does not cover installing any relays except for the engine fan. What other things will need a relay?

36 Diamond T cab
1st gen 12valve cummins 6BT, 5 speed manual trans
air ride (air compressor and battery behind cab)
no electric seats, no electric windows, no A/C - probably not even a stereo. I will have a USB and then all the normal things (lights, fog lights, wipers, heater).
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Old 09-04-2017, 09:53 PM
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Dr Crankenstein Dr Crankenstein is offline
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Air compressor. Headlights. Fog lights. Horn. Lift pump (if the Cummins uses one).

I'll leave the rest for you to sort out. Relays are good for everything and anything with high amp draw, so the switch doesn't have to carry the load...

.
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Old 09-04-2017, 10:29 PM
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bkvail bkvail is offline
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Quote:
Originally Posted by Dr Crankenstein View Post
Air compressor. Headlights. Fog lights. Horn. Lift pump (if the Cummins uses one).

I'll leave the rest for you to sort out. Relays are good for everything and anything with high amp draw, so the switch doesn't have to carry the load...

.
the cummins has a fuel shut-off solenoid - that I just found needs a 70-80 amp relay.

thanks for your help though - had forgotten about horn needing one!
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Old 09-05-2017, 04:08 PM
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Any fan - like the heater fan - might need a relay or it could back feed power back into the system.
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